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Thread: Cut long M4 Colt AR15 barrel to short barrel

  1. #1
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    Cut long M4 Colt AR15 barrel to short barrel

    Wondering if it would be feasible to cutdown a 16 inch M4 Colt barrel down to 12.5 inches? I was reading all of the threads referencing short NFA rifles and decided it was time to do something with my blank upper receiver.
    I would like to do a short barrel upper receiver project; a 10.5 and 11.5 inch barrel maybe too small for my taste. I like the idea of having the short barrel but also want the advantage of velocity, energy, and distance. I am looking for CQB, active shooter scenarios, and if I need to take out something up to 200-350 yds. ( I have other rifles that can reach out to 800 yds. if I needed them )
    The short 12.5 barrel makes sense. I know Colt doesn't make a 12.5 inch barrel; hence taking the long barrel and reducing it down. I would like to stick to Colt barrel as I have a registered Colt NFA lower receiver and my blank upper receiver is Colt M4. I would rather not mix and match manufacturers. ( Sorry guys...one stop shopping!) Does anyone know who can do the barrel reduction? Any opinions and advise is appreciated.

  2. #2
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    My advice is not to cut the Colt barrel. But, I sense that you will do it anyways. I would buy a Bravo Company 11.5" barrel and rebarrel your upper. You can offset the cost by selling your 6920 barrel assuming it is in proper shape and condition.

    I have a BCM 11.5" that I built and it runs like a champ. Anyone who has seen it will attest to that.

    Quote Originally Posted by Repr762 View Post
    Wondering if it would be feasible to cutdown a 16 inch M4 Colt barrel down to 12.5 inches? I was reading all of the threads referencing short NFA rifles and decided it was time to do something with my blank upper receiver.
    I would like to do a short barrel upper receiver project; a 10.5 and 11.5 inch barrel maybe too small for my taste. I like the idea of having the short barrel but also want the advantage of velocity, energy, and distance. I am looking for CQB, active shooter scenarios, and if I need to take out something up to 200-350 yds. ( I have other rifles that can reach out to 800 yds. if I needed them )
    The short 12.5 barrel makes sense. I know Colt doesn't make a 12.5 inch barrel; hence taking the long barrel and reducing it down. I would like to stick to Colt barrel as I have a registered Colt NFA lower receiver and my blank upper receiver is Colt M4. I would rather not mix and match manufacturers. ( Sorry guys...one stop shopping!) Does anyone know who can do the barrel reduction? Any opinions and advise is appreciated.





    "A firearm should be considered a fighting weapon first. Any other use should be considered a bonus." -Me

    Click here for Semper Paratus Arms AR15 armorer schedule/locations.

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Multiple armorer certifications

    I am affiliated and work with SIONICS Weapon Systems in Tucson, AZ

  3. #3
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    I've done it. The threads will start just ahead of the M203 notch. While cost is higher, one advantage is that you know you will have perfect threads if you plan on mounting a suppressor.

    I don't have a picture of the bare barrel because my I have a reflex suppressor, but since everybody loves pictures...


  4. #4
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    Quote Originally Posted by Repr762 View Post
    Wondering if it would be feasible to cutdown a 16 inch M4 Colt barrel down to 12.5 inches? I was reading all of the threads referencing short NFA rifles and decided it was time to do something with my blank upper receiver.
    I would like to do a short barrel upper receiver project; a 10.5 and 11.5 inch barrel maybe too small for my taste. I like the idea of having the short barrel but also want the advantage of velocity, energy, and distance. I am looking for CQB, active shooter scenarios, and if I need to take out something up to 200-350 yds. ( I have other rifles that can reach out to 800 yds. if I needed them )
    The short 12.5 barrel makes sense. I know Colt doesn't make a 12.5 inch barrel; hence taking the long barrel and reducing it down. I would like to stick to Colt barrel as I have a registered Colt NFA lower receiver and my blank upper receiver is Colt M4. I would rather not mix and match manufacturers. ( Sorry guys...one stop shopping!) Does anyone know who can do the barrel reduction? Any opinions and advise is appreciated.
    Nobody better than SAW to machine your Colt barrel down and make the proper gas port modifications. They aren't cheap but it will get done right including re-parking your barrel assembly. You will get it back looking better than new.
    Last edited by MarkG; 02-27-11 at 00:28. Reason: Syntax

  5. #5
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    That's true. I just hate seeing someone cut down a barrel for no reason when there are other options.

    Quote Originally Posted by MK18Pilot View Post
    Nobody better than SAW to machine your Colt barrel down and make the proper gas port modifications. They aren't cheap but it will get done right including re-parking your barrel assembly. You will get it back looking better than new.





    "A firearm should be considered a fighting weapon first. Any other use should be considered a bonus." -Me

    Click here for Semper Paratus Arms AR15 armorer schedule/locations.

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Multiple armorer certifications

    I am affiliated and work with SIONICS Weapon Systems in Tucson, AZ

  6. #6
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    The only AR barrel I have ever had cut down was an old Bushmaster 16in carbine barrel that I had no other use for. My SBR is registered as 10.5 but Ive been running a 12.5 on it for a while.

    Cut the Bushy 16in down to 10.5 and opened the gas port and put it on the original upper it came on with the pinned A2 front sight gas block assembly it came with as well and slapped a MOE handguard. Now I have a 10.5 available if necessary.

    I wouldn't cut a Colt barrel down. Just spend the $230 and get a BCM 12.5 BCM barrel.
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  7. #7
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    Thanks for the info guys. Like I mentioned before, I have a blank upper receiver and registered lower. I don't have the barrel yet but will consider all of your advise before proceeding.

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