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  • grimnar15

    Ultimate Member
    MDS Supporter
    Jul 21, 2019
    1,645
    Wanting to rebarrel my HBAR Colt 6721 AR-15A3 Tactical Carbine from 5.56/223 to 300BO?
     

    Speed3

    Ultimate Member
    Aug 19, 2011
    7,835
    MD
    Unless you are running it suppressed and have other 5.56/223 rifles, probably. I have a 300blk and only really shines suppressed honestly.
     

    scout6

    Active Member
    Sep 28, 2016
    601
    Ceciltucky
    why not just buy a complete upper, then you can swap back and forth whenever you want. (legal rifle OAL of course)
     

    davsco

    Ultimate Member
    Oct 21, 2010
    8,624
    Loudoun, VA
    what everyone above said (i tried to multi quote but failed...) except that i'll add, get your blackout upper, AND buy/build another lower to go with it!
     

    grimnar15

    Ultimate Member
    MDS Supporter
    Jul 21, 2019
    1,645
    Cool --- or since I have several Colts I can sell the 6721 And build a brand new pistol 300BO.
     

    3paul10

    Ultimate Member
    MDS Supporter
    Mar 6, 2012
    4,895
    Western Maryland
    exactly as the others have said...leave her alone, and get another upper....

    Be careful switching back and forth from 5.56 to 300, easy to make a mistake and blow her up...
     

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