COLT 6721 AR15A3 Modifications

COLT 6721 AR15A3 Modifications

This is a discussion on COLT 6721 AR15A3 Modifications within the Rifles forums, part of the Sniping Related category; Hey Guys so I have a Colt 6721 AR15A3 that im looking to make some modifications to. I was thinking about doing a front sight ...

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  • 1 Post By Tim37
  • 1 Post By gpark09

Thread: COLT 6721 AR15A3 Modifications

  1. #1
    Junior Member
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    Jan 2017
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    COLT 6721 AR15A3 Modifications

    Hey Guys so I have a Colt 6721 AR15A3 that im looking to make some modifications to.
    I was thinking about doing a front sight removal and adding a low profile gas block and a free float Hand guard.
    Adding a scope of some kind possibly a BDC looking for something in the 4-16 power range.
    Backup front and rear magpul flip up sights
    looking at also putting a 45 degree offset red dot on it as well for short range fast target acquisition.

    Just was looking for any input on particular makes a models of any associated parts and thoughts on the modifications or any advice moving forward.


    I've had the gun for about 3 years now and currently have a UTG 3-12 power scope on it paired with some cheap rings.
    The gun shoots Pretty well as is but decided I want to do some upgrades.
    I primarily shoot 855 62 grain ammo and currently achieve anywhere from 1 inch to 1 1/2 inch groupings at 100 yards

  2. #2
    Senior Member
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    Apr 2005
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    Why not just get a new upper? For the price you are about to pay to heavily mod out your existing setup, ya might as well get this
    PSA 18" Rifle Length 223 Wylde 1/7 Nitride 15" M-lok Upper w/out BCG or CH - 77932967+
    "Success usually comes to those who are too busy to be looking for it" - Henry David Thoreau

  3. #3
    Senior Member
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    I would buy or build a second upper. Toss a carry handle on the Colt.
    Hypo likes this.

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  5. #4
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    Any recommendations on an upper with good accuracy in 5.56 ?

  6. #5
    Senior Member gpark09's Avatar
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    Give White Oak Armament a call. Build for accuracy.
    Hypo likes this.

  7. #6

  8. #7
    Junior Member
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    May 2017
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    There is a company called ADCO who will shave your front gas block if you need to. I used them on my AR build and they do good work.

    The Midwest Industries handguards are very nice as well.
    Last edited by reconstyle; 05-24-2017 at 08:59 AM.

  9. #8
    Member Tape's Avatar
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    I have the same rifle and with a very good barrel and Timney trigger this is the results.

    sorry about the blur
    10 rds @ 100yds
    0.5790

    62gr
    Match Grade
    Attached Images Attached Images

  10. #9
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    Quote Originally Posted by Tape View Post
    I have the same rifle and with a very good barrel and Timney trigger this is the results.

    sorry about the blur
    10 rds @ 100yds
    0.5790


    62gr
    Match Grade

    are you using an aftermarket barrel or your just saying the stock barrel happens to produce very good accuracy paired with the trigger job?

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