LaRue Stealth Upper Compatibility [Archive]

Race

05-05-10, 10:14

Will a LaRue Stealth upper fit on a Colt LE6920? It seems to have the same receiver pin diameter as a Colt MT6400c, which I've been told has larger pins than mil spec.

Thanks.

Race

05-05-10, 10:28

Okay - got this answered by LaRue. It is compatible. My confusion stemmed from the fact that my MT6400c has the same size front pin diameter and the 6920. I've read that the MT6400c has a larger diameter front pin. Evidently they made some that were not larger?

The pin diameter on both of these rifles is 1/4".

Does anyone know of a link that shows the difference in the two front pin sizes?

Thanks.

hellbound

05-05-10, 13:03

i am 99.9% sure that whoever told you that is wrong. Colt stopped using the large pivot pins in the early 90s. Every LE6920 or MT6400C i've seen (including the two i've owned) come with an M4 marked Colt upper receiver which I don't believe was ever made with the large pivot pin.

they could have meant the FCG (hammer/trigger) pins which measure .170 as opposed to .154. in the past two years, Colt has gone back to using the .154 pins in their LE line (not sure about the MT line), but the FCG pins would not prevent you from swapping any upper you wanted on to your lower.

ST911

05-05-10, 14:16

Will a LaRue Stealth upper fit on a Colt LE6920?

I have both. Yes.

d90king

05-05-10, 14:35

Yes it will fit fine on a 6920... The older 6920 had the old FCG pins though. I had to swap mine to an LMT lower when I added a Wilson TTU trigger.

Great upper by the way. My 18"/13.2" is awesome and far more accurate than I am!

Race

05-05-10, 15:13

Thanks for the info. The 18/13.2 is the one I am considering.

As for the FCG pins, I'm having trouble deciphering the which size these are. The MT6400 is approx. 8 years-old, +/-. One of the 6920s is approx. 2-3 years old. The other 6920 is new. The FCG pins in all three visually look the same.

Would an 8 year-old MT6400 have standard FCG pins?

Thanks again.

hellbound

05-05-10, 21:35

my MT6400C's from 2002 and 2003 have the .170 pins

this is really a non-issue and will not affect compatibility with the LT stealth...

Race

05-06-10, 09:38

My issue with the .170 FCG pins is simply from a replacement parts compatibility standpoint.

hellbound

05-06-10, 10:58

My issue with the .170 FCG pins is simply from a replacement parts compatibility standpoint.

it's definitely not something to lose sleep over, the .170 FCG parts can be bought online, and chances are you'll wallow out the lower holes before you break a colt 5.56 hammer...

Geissele makes their triggers in .170 as well if you're looking for one of the best 2-stage triggers out there

Mega

05-06-10, 12:08

Great upper by the way. My 18"/13.2" is awesome and far more accurate than I am!

I agree!

http://www.mdshooters.com/gallery/files/4/4/4/1/spr-001.jpg

Race

05-06-10, 18:39

Mega - what scope mount do you have on that rifle?

I'm thinking about a SOPMOD stock for this 18" setup. Anyone know how the SOPMOD would balance with the 18" upper?

Belmont31R

05-06-10, 18:44

Mega - what scope mount do you have on that rifle?

I'm thinking about a SOPMOD stock for this 18" setup. Anyone know how the SOPMOD would balance with the 18" upper?

LaRue SPR-E, and the SOPMOD balances well with an 18".

Race

05-06-10, 18:51

Belmont - What is the SPR-E?

Mega

05-06-10, 19:43

Mega - what scope mount do you have on that rifle?

That is a Mueller 8.5-25x44AO Tactical Mil-dot on a LaRue SPR-E QD mount.

http://www.sportsmansguide.com/net/cb/mueller-ao-tactical-scope.aspx?a=354553

I own 3 different Mueller scopes and you can't get any better quality for the money.

Mega

05-06-10, 19:45

Belmont - What is the SPR-E?

http://stores.homestead.com/Laruetactical/Detail.bok?no=40

d90king

05-06-10, 20:33

I agree!

http://www.mdshooters.com/gallery/files/4/4/4/1/spr-001.jpg

Nice rifle! I am going to ditch the Harris and go with a BoBro when they are available and I will also put the MIAD back on and I am done. I will be going with a NF 2.5-10x32 for optics, the CQT is temp.... It really is an excellent upper in my opinion.

http://i156.photobucket.com/albums/t5/d90king/DSCN0007.jpg
http://i156.photobucket.com/albums/t5/d90king/DSCN0001.jpg

Race

05-06-10, 20:42

http://stores.homestead.com/Laruetactical/Detail.bok?no=40

Thanks. I'm trying to decide between a NF 1-4, or 2.5-10 scope.

Belmont31R

05-06-10, 20:46

Thanks. I'm trying to decide between a NF 1-4, or 2.5-10 scope.

If you shoot nose to charging handle the extended model would probably be better. If you shoot back further than NTCH the regular SPR 1.5 would be fine.

Keep in mind you cant mount the mount on various positions on the upper, and you have some flexibility in mounting the scope in the rings, too. Just mount the mount, get a good cheek weld for yourself, and then move the scope in the rings until you get a good sight picture.

Race

05-07-10, 07:58

Keep in mind you cant mount the mount...

Belmont - did you mean you can mount the mount...?

Race

05-07-10, 08:03

d90king

05-07-10, 15:40

d90king - I'm thinking about trying a fixed A2 stock lower as you have pictured for my 18/13.2 setup and maybe using the SOPMOD for a 16" Recce setup.

I haven't looked into the differences in the rail interfaces I see listed on the BCM site for their Recce offerings. I'll need to figure that out, too...

You are referring to Mega's rifle. Mine is below and has an ACS stock. I don't care fro the cheek weld on the A2 stocks. I prefer the cheek weld on the SOPMOD, EMOD and ACS personally. IMHO I think stocks are a highly personal decision as every shooter has different preferences and shooting positions.

If you want to see a REALLY, REALLY nice SPR build check out Belmont's rifle that he just posted in the AR pic thread it is PERFECTION in my opinion.

Mega

05-07-10, 17:10

IMHO I think stocks are a highly personal decision as every shooter has different preferences and shooting positions.

I would agree.
I like my A2, but that is just me. ;)

Race

05-07-10, 20:07

You are referring to Mega's rifle. Mine is below and has an ACS stock. I don't care fro the cheek weld on the A2 stocks. I prefer the cheek weld on the SOPMOD, EMOD and ACS personally. IMHO I think stocks are a highly personal decision as every shooter has different preferences and shooting positions.

If you want to see a REALLY, REALLY nice SPR build check out Belmont's rifle that he just posted in the AR pic thread it is PERFECTION in my opinion.

Good point - It has been a long time since I had an A2 stock. Would an A2 stock require more of a "chin" weld with a scope?

Mega - that's a nice rifle you have pictured.

scfast

05-07-10, 21:24

Good point - It has been a long time since I had an A2 stock. Would an A2 stock require more of a "chin" weld with a scope?

Cheek weld would be fine with an A2 stock and a larue mount and as others have stated lower fit will not be an issue and you will love the upper

http://www.mdshooters.com/gallery/files/4/4/4/1/spr-001.jpgNice gun mega dig the setup
Since you guys posted photos here is mine 16" 12.0.Photo about a year and a half old looks a little different now with ACS and xtm rail covers

http://i293.photobucket.com/albums/mm45/arfun4/DSCF0317copy.jpg