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Thread: SCAR CQC barrel length?

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    SCAR CQC barrel length?

    Okay, I got my scar barrel back from Marvin a few weeks ago cut down to 10" (factory CQC length correct?) Now this question is not based on anything but a few pictures I've seen, not solid evidence. Now I'm happy with it but it still looks like it's a half inch to long. Reason I say this is there's still a half inch of barrel behind my flash hider, where as the mk16 barrels I've seen the flash hider is basically right up against the gas block maybe 1/8" of shoulder. So is the real mk16 really 10" or more like 9.5"? Anyone know?
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    The factory CQC is a 10" bbl, but that is measured to the end of the threads, so the barrel's shoulder (where the FH bottoms out) is at about 9.5".

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    Quote Originally Posted by 99HMC4 View Post
    Okay, I got my scar barrel back from Marvin a few weeks ago cut down to 10" (factory CQC length correct?) Now this question is not based on anything but a few pictures I've seen, not solid evidence. Now I'm happy with it but it still looks like it's a half inch to long. Reason I say this is there's still a half inch of barrel behind my flash hider, where as the mk16 barrels I've seen the flash hider is basically right up against the gas block maybe 1/8" of shoulder. So is the real mk16 really 10" or more like 9.5"? Anyone know?
    Totally unrelated but was curious about a few things... I have a 16S that I would like to SBR and would like to know the following:

    How much $$$ is the barrel chop?
    I intend to run the rifle un-suppressed mostly, does Marvin adjust the gas port so that the rifle runs reliably at that length or did you have somebody else do it for you?
    What was the turnaround time?

    Thanks,
    JC

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    Quote Originally Posted by JasonM View Post
    The factory CQC is a 10" bbl, but that is measured to the end of the threads, so the barrel's shoulder (where the FH bottoms out) is at about 9.5".
    Now this statment is made with the fact that i am happy with marvins work, it is top notch job. That being said I did want it to at least look like the mk16 barrel and it does not due to the extra 1/2" behind the flash hider. Knowing this cutting the 16s barrel to 10" is incorrect? To get a real mk16 copy it needs to be 9.5" right? Marvins price was in the $150 range and 6 week turn around, good work as well....
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    Quote Originally Posted by 99HMC4 View Post
    Now this statment is made with the fact that i am happy with marvins work, it is top notch job. That being said I did want it to at least look like the mk16 barrel and it does not due to the extra 1/2" behind the flash hider. Knowing this cutting the 16s barrel to 10" is incorrect? To get a real mk16 copy it needs to be 9.5" right? Marvins price was in the $150 range and 6 week turn around, good work as well....
    Thanks for the info... I will contact Marvin and get my barrel sent to him for the chop.

    JC

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    He did a great job, regardless of my 1/2" questions. Im glad i chopped up my expensive FN barrel.....
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    Quote Originally Posted by 99HMC4 View Post
    He did a great job, regardless of my 1/2" questions. Im glad i chopped up my expensive FN barrel.....
    I can trade you my unmolested barrel for your 1/2" too long barrel and you can have it done to your desired 9.5" length if you want to try that...

    Thanks for the info...
    JC

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    Bump!
    I havent got the "the only guys who know wont post" comment yet so I would really like to get this cleared, seeing how many of us scar owners SBRed their barrels....
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    Quote Originally Posted by 99HMC4 View Post
    Bump!
    I havent got the "the only guys who know wont post" comment yet so I would really like to get this cleared, seeing how many of us scar owners SBRed their barrels....
    My Barrel came back last week. I has asked for 10" and have not bothered to measure it but suffice it to say it is short enough. Marvin is a busy guy and it was exactly 6 weeks to the day I sent it to him that I had it back. The work is flawless and well worth the wait. The rifle shoots great, required minimal re-zero'ing, and now I await my form 4 (going on 3 months now) for my suppressor.

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    He does good work but this has nothing to do with my question and or thread. Im asking industry experts about the real measured length of the MK16 cqc barrel (and some one told me that part). So that way guys who want a tru to spec copy can get it. As i said, 10" barrel leaves a noticable gap between the flash hider and gas block. The mk16 does not have this, so i guess the barrels will have to be cut to 9.5" to get the mk16 overall length? How would smiths cut the 16s barrel to match the mk16 barrel? Im asking SCAR experts for help not bashing or asking others to defend marvins work. He did a great job, it just doesnt look like a mk16 barrel........
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    Quote Originally Posted by 99HMC4 View Post
    He does good work but this has nothing to do with my question and or thread. Im asking industry experts about the real measured length of the MK16 cqc barrel (and some one told me that part). So that way guys who want a tru to spec copy can get it. As i said, 10" barrel leaves a noticable gap between the flash hider and gas block. The mk16 does not have this, so i guess the barrels will have to be cut to 9.5" to get the mk16 overall length? How would smiths cut the 16s barrel to match the mk16 barrel? Im asking SCAR experts for help not bashing or asking others to defend marvins work. He did a great job, it just doesnt look like a mk16 barrel........
    Are you using the AAC 51t Blackout? It would help if we could see what you are talking about.
    Last edited by Eurodriver; 10-28-11 at 10:38.

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    Quote Originally Posted by 99HMC4 View Post
    He does good work but this has nothing to do with my question and or thread. Im asking industry experts about the real measured length of the MK16 cqc barrel (and some one told me that part). So that way guys who want a tru to spec copy can get it. As i said, 10" barrel leaves a noticable gap between the flash hider and gas block. The mk16 does not have this, so i guess the barrels will have to be cut to 9.5" to get the mk16 overall length? How would smiths cut the 16s barrel to match the mk16 barrel? Im asking SCAR experts for help not bashing or asking others to defend marvins work. He did a great job, it just doesnt look like a mk16 barrel........
    Looking at the bbl on the MK16 CQC on FN's website:
    http://www.fnhusa.com/mil/products/f...20&mid=FNM0110

    There's a slight gap between the gasblock and the back of the FH, even with a AAC Blackout.

    It also says the bbl length is 10".

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    Yeah there is a gap but mine is more, im using an AAC blackout not the mount version just flash hider. I cant find it but theres a few pictures floating around of a mk16 barrel on a bench without the flash hider and yopu can see how close the threads get the gas block. As is said its not a big deal but if done why not done right? Might as well cut it the the exact same dimensions as the mk16 right? I would love to get a mk16 to compare to my 16s. Does FN measure their barrel from a different point?
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    Quote Originally Posted by 99HMC4 View Post
    Yeah there is a gap but mine is more, im using an AAC blackout not the mount version just flash hider. I cant find it but theres a few pictures floating around of a mk16 barrel on a bench without the flash hider and yopu can see how close the threads get the gas block. As is said its not a big deal but if done why not done right? Might as well cut it the the exact same dimensions as the mk16 right? I would love to get a mk16 to compare to my 16s. Does FN measure their barrel from a different point?
    Again, pictures would help. You understand that the suppressor mount recesses over the barrel right? Creating a smaller "gap"?

    http://www.hi-desertdog.com/index.ph...&productId=384



    Looks like 1/2" to me.

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    Yeah I know mount has bit of an overlap, I wasthinking that might be it. I can't find the pictures, there's two the clearly show the mk16 barrel and the threads end right ate the shoulder were the barrel diameter starts to increase. There was maybe 1/8" of large diameter barrel past the block, then threads. Maybe these were pre production R&D/T/E parts? Any pics of current issued barrels?
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    Okay, i found a few pictures but nit the ones I wanted. Im starting to think maybe the barrel picture I saw was a prototype barrel. It was had a huge profile under the rail (like 1" big) and the threads I know for sure were much closer than 1/2". Any way noit really a big deal but Im still wanitng to know the exact mk16 barrel specs. Heres some pictures of mine and others....
    Mine:

    mk16 pics:






    They look pretty close but we cant base fact off some pictures....
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    If you put an AAC suppressor mount on your barrel, it will look exactly like the pictures.

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    Quote Originally Posted by Eurodriver View Post
    If you put an AAC suppressor mount on your barrel, it will look exactly like the pictures.
    That's why the more I think aboutcit the more I think the barrel I'm thinking of is not the production barrel. I remember thinking that that barrel did not leave much room between the muzzle and gas port. At the same time there would be no way to fit a flag hider mount that had a back side offset on it either. I still want to examine a mk16....
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    Chuck Norris has to maintain a concealed weapon license in all 50 states in order to legally wear pants.

  19. #19
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    Quote Originally Posted by Eurodriver View Post
    If you put an AAC suppressor mount on your barrel, it will look exactly like the pictures.
    Here's another pic of a fellow member here. He had Marvin fo his barrel as well, AAC black out mount.....
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    Chuck Norris has to maintain a concealed weapon license in all 50 states in order to legally wear pants.

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    Here's the CQC Marvin did for me. To be honest, I never even dropped a rod in it to see exactly how long it is.


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