View Full Version : Colt MT6400C vs. Colt 6920
I did a quick side-by-side and was wondering, besides the lack of a bayonet lug on the MT, what are the differences?
Thanks,
Chris
If I remember correctly the MT6400C has a fixed buttstock and a muzzle brake instead of flash suppressor to comply with ban requirements. The rollmarks, of course are different as well.
Looking at the pictures from the Colt web sights, it would appear the muzzles devices are different. I wonder what differences there are in components, if any. Ultimately, I'm trying to decide which one to order.
6920
http://www.colt.com/law/images/lecarbine.jpg
MT6400C
http://www.coltsmfg.com/cmci/images/MTM4_BIG.jpg
Right now it really depends on what you can find. If you are offered both and at the same price, go with the 9620. You may be able to find a better deal on the 6400 though and if you're going to change out the stock and/or muzzle device anyway you might as well go with the cheaper model.
The 6400c comes with the cut down, neutered style bolt carrier whereas the 6920 will come with an M16 carrier.
The 6400c comes with the cut down, neutered style bolt carrier whereas the 6920 will come with an M16 carrier.
Interesting, I wasn't aware of that.
6400C also comes with 9 round magazines. Other than that, I think the other posters have covered the main differences.
BravoCompanyUSA
10-22-06, 16:29
get the 6920
The 6400 will have a stock that will not adjust. It would have to be completely replaced (approx $80 - $175), depending on the mfg.
The 6400 will have that silly muzzle devise. To replace would cost $50-$100
The 6400 will not have a regular size mag (value $15)
The 6400 will not have the M16 carrier.
The 6400 will have lower resale value.
If the features listed above don't mean much for your use, than the 6400 is a high quality option.
I have owned both models. My understanding is the last batch of MT6400s came with a M16 bolt carrier. The switchover was Colt wide, older 6920s didn't have the M16 carriers, IIRC. I didn't think Colt made the Match Target series any more, are they still producing 6400s?
The difference is the rollmarks, pinned muzzle brake versus threaded on flashhider, fixed faux collapsible stock versus real collapsible, bayonet lug missing on the 6400.
I'd get the 6920 unless you are legally bound to get 6400, or it costs enough less that de-bannifying it would be less than getting a 6920. They do have "M4 Carbine" rollmarks, which are kind of cool, but I didn't like the "Match Target".
I bought a 6400C back during the stupid AW ban and that thing still runs like a Singer sewing machine!! It is truly a fine "almost-true Colt" M4 for those that think Colt is G-D. Mine came with that ridiculous muzzle brake too. In my opinion, that is the number one reason not to get one now that you have the choice between it and a 6920.
That said, I had the brake removed, a phantom put in its place and added a Magpul CTR and I will never get rid of that rifle. If I could have a bought a 6920 for just a couple $100 more back then I would've though.
docsprague
10-23-06, 09:33
Does the 6400 come 1/9 barrel and the 6920 come with a 1/7?
Does the 6400 come 1/9 barrel and the 6920 come with a 1/7?
Both are 1/7".
MT6400C (http://www.coltsmfg.com/cmci/MTM4.asp)
LE6920 (http://www.colt.com/law/lecarbine.asp)
Does the 6400 come 1/9 barrel and the 6920 come with a 1/7?
Nope. My 6400MT has a 1:7" twist.
harleytech
10-23-06, 11:58
I have a 6400c and I replaced the buttstock with an OEM Colt M4 4-Position Buttstock, Replaced the Barrel with a Colt LE6921 14.5" w/ Pinned Elongated A2 FH, Replaced the Trigger Springs with JP springs and It never Hiccups ! Not once. The "M4 Carbine" Roll Marks are cool too...Damn Fine M4 ! :D
olds442tyguy
10-24-06, 15:48
I have owned both models. My understanding is the last batch of MT6400s came with a M16 bolt carrier. The switchover was Colt wide, older 6920s didn't have the M16 carriers, IIRC. I didn't think Colt made the Match Target series any more, are they still producing 6400s?
The difference is the rollmarks, pinned muzzle brake versus threaded on flashhider, fixed faux collapsible stock versus real collapsible, bayonet lug missing on the 6400.
I'd get the 6920 unless you are legally bound to get 6400, or it costs enough less that de-bannifying it would be less than getting a 6920. They do have "M4 Carbine" rollmarks, which are kind of cool, but I didn't like the "Match Target".
A big plus one to that. The last I heard, the MT line was killed off in early 2005.
Looks like this has worked itself out since the MT line has been discontinued.:)
harleytech
10-24-06, 17:54
Maybe a Collectable in the future, Since it's not made anymore...
:D
Maybe a Collectable in the future, Since it's not made anymore...
:D
Let's hope. ;) Good point - could removing the crappy brake diminish the value of the rifle since it's not in its original configuration. . . . not that it's being sold in my lifetime but it'd be nice to know.
-Boris
harleytech
10-27-06, 21:31
Since I swapped Barrels , And Buttstock , I still Have the Stock Parts. But I would never sell it anyway...:rolleyes:
I don't believe the Match Target line has been discontinued, but they are generally unavailable right now. Like seemingly everything Colt makes, they manufacture their rifles and carbines in batches. Nothing from the MT line has been made since March, IIRC, and isn't likely to me made again until sometime in early '07.
HTH,
Brewer
6920's are vaporware. If you can find one, get it! I did however manage to pick up a 6721 to stock.
C4
Chris Poston
11-02-06, 11:18
Lawmens Safety supply in Raleigh,N.C. # 919-779-6141 had some new 6920's last week. Might be a source if anyone is still looking.
If you live in a ban state then the MT6400C is your only choice, it is a fine rifle (except for the retarded brake).
If you live in a free state then I would look until you find a 6920.
fivepointoh
11-07-06, 20:40
Mine use to be an MT
It was heavy!!! and LOUD!!!!
Sorry to use the paddles and bring an old thread back to life but I thought it was better than adding a new one since my question is in this one.
The only 6920 listed in Colts site right now is a LE6920,
Since I would only be able to get a MT6400C, am I better off getting a Bushmaster M4A3 since I can pay the tax of 200 and get the 14.5 inch model or get the 16.1, And the BM has the fully lined chrome barel and chamber.
Also what about the 6920 being stated as to be chambered in 5.56, and the 6400 in .223...
BTW, it would only be a home defense weapon and will shot at the ole cabin maybe 2-3 times a month. But I was ADD advanced in high-school so I can and would prefer to just spend a little more and get the best.
Would honestly like to have the closet rendition of an M4.
Thanks Guys,
Zachery
The only 6920 listed in Colts site right now is a LE6920,
Since I would only be able to get a MT6400C, am I better off getting a Bushmaster M4A3 since I can pay the tax of 200 and get the 14.5 inch model or get the 16.1, And the BM has the fully lined chrome barel and chamber.
Zachery
i don't beleive you are ever better off with a bushmaster, than a colt. especially, if it will be used in the home defense role. i would pay the extra and get the 6400c. m.h.o.
i don't beleive you are ever better off with a bushmaster, than a colt. especially, if it will be used in the home defense role. i would pay the extra and get the 6400c. m.h.o.
Thanks,
I am trying to figure out what the deal is in NC about the 14.5" barrel stuff.
I found a used MT6400C in a local store that a guy is selling but he hasn't caled me back yet.
It was made in 2004 and has a nice ACE skeleton stock full size and it fells so good. This is going to be my first AR-15 purchase and I think it has what I wan't. Mostly the 1:7 barrel to shoot the heavier grain ammunition. I believe the lady at Colt yesterday told me the barrel and chamber are chrome lined also. Oh and BTW, I loved the trigger...It would not move until it broke, at @ 3.5 lbs I am guessing, and I was impressed, reminded me of a good 1911 you know.
I got a MT6400c during the ban days. When the ban died, I replaced the fixed stock with a Vltor & I sent the upper to ADCO to have barrel threaded so I could add a Flash Suppressor & get rid of that muzzle brake. I have a Bushmaster & never had any problems with it, but the Colt is my favorite. My MT6400C has a chrome-lined chamber & bore and it has 5.56mm chamber, not .223, 1/7 twist
Why can't you get a LE6920? My friend got one couple weeks ago. I would get a LE6920 if I had the choice.
I got a MT6400c during the ban days. When the ban died, I replaced the fixed stock with a Vltor & I sent the upper to ADCO to have barrel threaded so I could add a Flash Suppressor & get rid of that muzzle brake. I have a Bushmaster & never had any problems with it, but the Colt is my favorite. My MT6400C has a chrome-lined chamber & bore and it has 5.56mm chamber, not .223, 1/7 twist
Why can't you get a LE6920? My friend got one couple weeks ago. I would get a LE6920 if I had the choice.
I am awaiting a call back from ATF in Charlotte for the "Official" info on that.
I would prefer the 6920 as I think the 6400 I am looking at is .223, The barrel wouldn't be different from the lower would it.
I need to call the range and have them check for me, I would rather have the LE6920 b/c of it's designation as 5.56, even on Colts site the MT6400c is labeled as .223.
Why are you worried about a 14.5" barrel on a 6920?:confused:
The 6921 is the 14.5" barrel version.
Why are you worried about a 14.5" barrel on a 6920?:confused:
The 6921 is the 14.5" barrel version.
It's not that, sorry for the confusion...
I can't get a straight asnwer from the local shops about me, a Civilian, purchasing a 6920 which from Colt is marked LE Gov't use...
Even the lady at ATF in Charlotte told me she would have to call me back. I am aware of the 200 registration/tax/fee for a barrel under 16" but with the markings on the rifle I can't get a straight answer yet. We have a grat class III dealwr but he is ata gun show and I can't reach him until next week.
Colt told me yesterday that they keep those marking for the 7 states that kind of have their own state laws that are very similar to the ban laws. And that I should be able to buy the LE6920 which is the one I want.
Any clarrification from anybody who works for a dealer would be awesome, I have been reading off of ar15.com for almost 3-4 hours in the past 2 days...
If you can buy a new production Bushmaster you can buy a 6920. The markings on the receiver are irrelevent.
If you can buy a new production Bushmaster you can buy a 6920. The markings on the receiver are irrelevent.
That's what I thought but local shops are telling me different,
Is it worth getting a 5.56 versus a .223rem? I mean the barrel marked as 5.56 w/the lower...
That's what I thought but local shops are telling me different...
Find a different shop.
Find a different shop.
I did, thanks...
Talked with a smaller but down-home awesome one at lunch,
He set me straight, even got out his book and made three or four calls looking to find me a supplier with a 6920, he found 7 6921, which I might conside b/c I can't imagine getting ahold of the grenade launcher but who knows.
Then he told me that if I can get the 2yd ol Match Target m4 for the price I told him, then get IT.
he told me he sold a 10 yr old barely shot 6400 for 200 more then what I am getting this one for.
I like honest folks...:cool:
The 6400c comes with the cut down, neutered style bolt carrier whereas the 6920 will come with an M16 carrier.
Anyone got any pics of the differences,
I can access the pic from Bushy web-site for the A3M4 parts diagram but don't know what the 6400 part would look like.
http://www.bushmaster.com/electronic-documents/2007Catalogv1/Page40-41Schematic2007.pdf
Robb Jensen
03-08-07, 06:33
Anyone got any pics of the differences,
I can access the pic from Bushy web-site for the A3M4 parts diagram but don't know what the 6400 part would look like.
http://www.bushmaster.com/electronic-documents/2007Catalogv1/Page40-41Schematic2007.pdf
unshrouded older Bushmaster AR15 carrier, RRA 'enhanced' AR15 carrier, Colt M16 carrier.
http://img.photobucket.com/albums/v408/gotm4/carriers.jpg
The MT carrier is like one of these below.
Here's two 1/2 circle Colt carriers.
My 3gun rifles carrier, it's a Colt 1/2 circle unshrouded carrier. It's light for less recoil. The barrel is a midlength and I use an Enidine buffer w/standard power CAR buffer spring. Less moving mass = less felt recoil & muzzle lift.
http://img.photobucket.com/albums/v408/gotm4/handguardwrail008.jpg
My wifes 3gun'ish rifle Colt 1/2 carrier, shrouded firing pin.
http://img.photobucket.com/albums/v408/gotm4/handguardwrail007.jpg
The MT carrier is like one of these below.
WOW, thats significant,
So to help a new guy out, can you explain why they would do that and if I wait and get the 6920 from Colt, it will have the M16 style carrier, right.
Does the one in the 6400 look like the AR15 or the enhanced version.
Thanks for the help,
Robb Jensen
03-08-07, 06:59
WOW, thats significant,
So to help a new guy out, can you explain why they would do that and if I wait and get the 6920 from Colt, it will have the M16 style carrier, right.
Does the one in the 6400 look like the AR15 or the enhanced version.
Thanks for the help,
I believe the newest ones I've seen from Colt in their commercial rifles were shrouded but still 1/2 circle. Yes, the 6920 has a M16 carrier.
Commercial Colt is kinda weird, they do a combination of things so that you can't add an auto sear or M16 FCG parts and mil-spec sized pinned uppers on to their lowers. These things are different (larger) hammer and trigger pins, hardened block above the safety, and large pivot pin uppers.
If you want an M16 carrier you can buy one and just add it to a 6400 if you don't have the lower receiver block in it, and either sell or just use the 6400s carrier in another rifle build. Some full circle carriers will still work even with the block in the lower. The RRA has a bit longer section at the tail and may not fit. If you do run a M16 carrier it's wise to get a non-notched AR15 hammer (these are available from DPMS).
I believe the newest ones I've seen from Colt in their commercial rifles were shrouded but still 1/2 circle. Yes, the 6920 has a M16 carrier.
Commercial Colt is kinda weird, they do a combination of things so that you can't add an auto sear or M16 FCG parts and mil-spec sized pinned uppers on to their lowers. These things are different (larger) hammer and trigger pins, hardened block above the safety, and large pivot pin uppers.
If you want an M16 carrier you can buy one and just add it to a 6400 if you don't have the lower receiver block in it, and either sell or just use the 6400s carrier in another rifle build. Some full circle carriers will still work even with the block in the lower. The RRA has a bit longer section at the tail and may not fit. If you do run a M16 carrier it's wise to get a non-notched AR15 hammer (these are available from DPMS).
Sounds like I need to just get a 6920...lol...
I know where there are 5 for 1,500 each...
But am going to call around.
Also is it a big deal to have the comp removed form a 6400 and the barrel threaded to accept a FS of your choice.
Thanks again, I can't tell you how much of a help you have already been.
Also is it a big deal to have the comp removed form a 6400 and the barrel threaded to accept a FS of your choice.
In 2004, I shipped my upper to ADCO (an Authorized Dealer on this forum). Around $60 & 10 days later, I had the upper back with an A2 flash suppressor.
http://http://www.adcofirearms.com/shopservices_.cfm?page=shop (http://www.adcofirearms.com/shopservices_.cfm?page=shop)
Thanks cqbdriver
I just called Lawmans Safety in Raleigh and he said they just got in 20, 6920 Colts, for 1,250.00 each, so I am not buying the used 6400 for 1,000. That would be stupid of me...wouldn't it...
Thanks for the info...
It will not be my last series of questions...:cool:
You won't regret getting the LE6920.
You did make one mistake - never let people know about a good deal until you have your rifle in your hand! :)
Correct response would be: "I just got a LE6920 for $1250 & there are 19 left if anyone else wants one."
chapperjoe
03-08-07, 12:16
you wanna throw me the info on the MT for 1000$?
You won't regret getting the LE6920.
You did make one mistake - never let people know about a good deal until you have your rifle in your hand! :)
Correct response would be: "I just got a LE6920 for $1250 & there are 19 left if anyone else wants one."
ROFL...Your funny!
I will have mine,:D no worries mate...
I have never been one to hide a bargain...Some people will take advantage of it and get a deal. Then I helped them out. Also if they sell them faster then I helped out a bussiness that is a law enforcement sales only place.
Trust me if I didn't like the place I wouldn't have said anything.
you wanna throw me the info on the MT for 1000$?
I.M. sent...:D
Mine has the S/A half-moon carrier with unshrouded firing pin, and the bolt was simply marked, "C" (not the "MPC" like my 6920/21's). Upper receiver forge markings vary, and older lowers say Colt's Mfg while the newer said Colt Defense. My upper is marked M4, but I don't remember if the bottom was milled for autosear. Its still back home in the states so I can't check it now.
The first batches had the brakes attached with roll pins. After getting complaints, they switched to solid pins. Here's a good photo someone posted years ago on TOS:
http://i13.tinypic.com/4d65tus.jpg
From a fighting gun standpoint, the 6920 is the logical choice. From a collector's standpoint, the 6400C can still command high prices simply because of the unique markings of the lower receiver. I sold the fixed stock on the EE to someone in CA for $60, but haven't dealt with the muzzle brake yet. I don't really care about the bayo lug issue. They don't fix 16" anyway, and if they did I still wouldn't use one.
I don't really care about the bayo lug issue. They don't fix 16" anyway, and if they did I still wouldn't use one.
I didn't know that, what about the M4s though...
I need to research that.
For M4, you need a 14.5" barrel for the bayonet to attach properly. The bayonet uses the Flash Suppressor & front sight for attaching to rifle.
One correction, I did remember an extended bayonet made just for 16" barrels. Bottom bayonet:
http://i6.photobucket.com/albums/y232/Alpha-Romeo3/Hunting/BayonetsOntarioOKC3S-ExtGenCutM7-MD.jpg
..or you can get a middy with 16'' barrel
Frens! Ciao amico mio, cosa stai insinuando?
Midlength+Extrema Ratio :D
http://i19.tinypic.com/3za5v01.jpg
ciao Kisara!
AR + Extrema Ratio...mmm....nice combo! ;)
Perfect example: 6400 lower sold at $400 in less than half an hour.
http://www.bubblegumforum.com/forums/topic.html?b=7&f=21&t=425843 (http://www.ar15.com/forums/topic.html?b=7&f=21&t=425843)
Maybe a Collectable in the future, Since it's not made anymore...
:D
Found this old thread in a search (on google). Can someone confirm this, are they no longer made?
I have one (need one here in N.J.) and haven't been able to find another anywhere. I could get another 6920 and modify it I suppose, but just curious.
Also, anyone know if the 6400 has the M4 ramps?
With regards to the MT6400C specs.
I bought one about 6 months ago. I don't know how old it was, it was NIB but sitting in the basement of the gun store for god knows how long. Anyway, the lower was marked Colt Mfg Co. not Colt Defense. The bolt carrier is M16, it has M4 feedramps, barrel is c mp 1/7 5.56, H buffer, etc etc. It is a clone of a LE6920 except the muzzle brake, fixed stock, and bayo lug.... and cooler roll marks. As above, it comes with a 9 round mag since it is a ban compliant gun. I bought it because i live in New York. If you can find one you should buy it.
Zanshin
Sorry to use the paddles and bring an old thread back to life but I thought it was better than adding a new one since my question is in this one.
The only 6920 listed in Colts site right now is a LE6920,
Since I would only be able to get a MT6400C, am I better off getting a Bushmaster M4A3 since I can pay the tax of 200 and get the 14.5 inch model or get the 16.1, And the BM has the fully lined chrome barel and chamber.
Also what about the 6920 being stated as to be chambered in 5.56, and the 6400 in .223...
BTW, it would only be a home defense weapon and will shot at the ole cabin maybe 2-3 times a month. But I was ADD advanced in high-school so I can and would prefer to just spend a little more and get the best.
Would honestly like to have the closet rendition of an M4.
Thanks Guys,
Zachery
The MT 6400 C is roll marked "223" on the lower. The 6920 (and all the Colt carbines roll marked "Law Enforcement" are stamped "5,56". Does any one know if the 223 and 5,56 chamber are really different and what's the difference?:big_boss:
I got a MT6400c during the ban days. When the ban died, I replaced the fixed stock with a Vltor & I sent the upper to ADCO to have barrel threaded so I could add a Flash Suppressor & get rid of that muzzle brake. I have a Bushmaster & never had any problems with it, but the Colt is my favorite. My MT6400C has a chrome-lined chamber & bore and it has 5.56mm chamber, not .223, 1/7 twist
Why can't you get a LE6920? My friend got one couple weeks ago. I would get a LE6920 if I had the choice.
Now all the MT are roll marked "223",and all the LE "5,56". I know that the 5,56 and 223 rounds are different (the first is more heavy), but the cambers 223 and 5,56 are really different? And what's the difference? :confused:
Now all the MT are roll marked "223",and all the LE "5,56". I know that the 5,56 and 223 rounds are different (the first is more heavy), but the cambers 223 and 5,56 are really different? And what's the difference? :confused:
Come on, guys. There is a sticky at the top of the "Technical Discussion" page.
https://www.m4carbine.net/showthread.php?t=55149
Now all the MT are roll marked "223",and all the LE "5,56". I know that the 5,56 and 223 rounds are different (the first is more heavy), but the cambers 223 and 5,56 are really different? And what's the difference? :confused:
Check what is stamped on the barrel - not the lower. I'd bet that it is still 5.56mm. I know some Colts have had lowers stamped with .223, but the barrels were 5.56mm
yup all colt barrels are chambered for 556 (except for the one with 24'' SS barrel if I'm not mistaken)
Check what is stamped on the barrel - not the lower. I'd bet that it is still 5.56mm. I know some Colts have had lowers stamped with .223, but the barrels were 5.56mm
I know that some MT have the barrel stamped "5,56" and the lower roll marked "5,56". The barrel of my new M4 is stamped "C /MP 1/7", not "5,56". Otherwise if you take a look on the Colt catologue You can see that all the MT are "223 caliber", and "they can shoot 5,56". Consequently my M4 should be 223.
But the question remains the same: 223 and 5,56 chambers are really different? Furthermore, If 223 and 5,56 are different, why some Colt carbines have different calibers stamped on diffent parts of the gun?:confused:
But the question remains the same: 223 and 5,56 chambers are really different?
No, the question doesn't remain. Only your refusal to look at the answer.
https://www.m4carbine.net/showpost.php?p=670048&postcount=1
But the question remains the same: 223 and 5,56 chambers are really different? Furthermore, If 223 and 5,56 are different, why some Colt carbines have different calibers stamped on diffent parts of the gun?:confused:
Yes, there is a difference between the two chambers. A 5.56 chamber is very slightly larger than the .223.
Also, Colt 6400 chambers are 5.56, regardless of what you see on the lower.
Did someone just necro-post in a thread that is over 2 years old?
Cameron
Did someone just necro-post in a thread that is over 2 years old?
Cameron
:laugh:
That would be true!
No, the question doesn't remain. Only your refusal to look at the answer.
https://www.m4carbine.net/showpost.php?p=670048&postcount=1
Thank You, and excuse me. I'm only two years late....:sad:
Yes, there is a difference between the two chambers. A 5.56 chamber is very slightly larger than the .223.
Also, Colt 6400 chambers are 5.56, regardless of what you see on the lower.
Thank You. I really don't understand this strange Colt policy. A rifle stamped with a wrong caliber!!!! Impossible to know why, I suppose
Thank You, and excuse me. I'm only two years late....:sad:
You asked the question Sunday. I gave you a link to the answer 2 posts later. You asked the question again. Who's the sad one?
Thank You. I really don't understand this strange Colt policy. A rifle stamped with a wrong caliber!!!! Impossible to know why, I suppose
just a guess... a 223 marked lower make a rifle easier to export & import is some EU countries
You asked the question Sunday. I gave you a link to the answer 2 posts later. You asked the question again. Who's the sad one?
Why are you berating this fellow over all of nothing? And where in your posted link does it address his Colt question?
Why are you berating this fellow over all of nothing? And where in your posted link does it address his Colt question?
Where I put the link to the .223 vs 5.56 sticky, which is at the top of Technical discussion. No one here minds answering a newbe question, even if it has been asked and answered many times. But when one of us provides an answer and it is ignored by the questioner, it gets annoying.
just a guess... a 223 marked lower make a rifle easier to export & import is some EU countries
Its gotta be something to do with import/export like that. Steyr does something similar since they mark the AUG as .223 despite it actually being chambered in 5.56...
You asked the question Sunday. I gave you a link to the answer 2 posts later. You asked the question again. Who's the sad one?
I asked two different questions. Evidently You are not understandig the second one as Frens, Safetyhit and BRT870 do.With no doubt when You will understand the question You will be the first to find the right answer.
At present don't worry about the repeated question. repetita iuvant
I asked two different questions. Evidently You are not understandig the second one as Frens, Safetyhit and BRT870 do.With no doubt when You will understand the question You will be the first to find the right answer.
At present don't worry about the repeated question. repetita iuvant
Obviously I don't understand. Twice, you have made posts asking this question
But the question remains the same: 223 and 5,56 chambers are really different?
Both times, I have given you a link to a "stickie" in the "AR Technical Discussion," titled 5.56mm NATO versus 223 Remington Chamber Differences. It is a very detailed post, including graphics, describing the very differences you are asking about. I have never addressed your other questions about Colt rollmarks.
Just to reiterate as I think I posted in this thread 2 years ago...
The Colt MT6400C that I own, and the one that my brother in law owns, both have 5.56 chambers. It is stamped on the barrel C MP 5.56 1/7 or something like that. The barrel is identical to that of the LE6920 except of course that it has a target crown instead of a threaded muzzle. The MT6400 has no comp. The MT6400C has a pinned comp.
If you go by the "chart" the MT6400C is the equivalent of a LE6920 in quality and most on this site would urge you to buy it over a Bushmaster of any model. The only downside to a MT6400C is that it is neutered, but if you are a ban stater like me that is a plus.
I live in a ban state and I own one. The only thing I don't like about it is the fixed stock. I will probably put a Sully on it when I get around to it.
Zanshin
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