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AR10/AR15 Part Commonality

Discussion in 'Rifle Country' started by NorCalRifleman, Feb 27, 2007.

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  1. NorCalRifleman

    NorCalRifleman Member

    Joined:
    Aug 5, 2006
    Messages:
    43
    Location:
    San Antonio, TX
    I know that the two rifles have a multitude of interchangeable parts, but which ones? I know the upper and lower are not interchangeable and obviously the barrel and bolt aren't, but is the bolt carrier? DPMS sells a .308 bolt but no .308 bolt carrier or full assembly. As far as I know everything else except maybe the charging handle are interchangeable. Anyone got the facts on this?

    Thanks.
     
  2. Zak Smith

    Zak Smith Moderator Emeritus

    Joined:
    Dec 24, 2002
    Messages:
    9,037
    Location:
    Fort Collins, CO, USA.
    ETA: for an ArmaLite AR-10:

    Bolt carrier is NOT the same. Firing pin assembly NOT the same.
    Buffer and buffer spring NOT the same.
    Carbine-length receive extension tube NOT the same.
    Bbl nut and some associated handguard parts NOT the same.
    Gas tube NOT the same.
     
  3. rbernie
    • Contributing Member

    rbernie Member

    Joined:
    Jan 21, 2004
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    20,561
    Location:
    Norra Texas
    Between a standard pattern AR-15 and an Armalite AR-10, here's my list from memory.
    Not the same:
    • receivers, upper and lower
    • barrel/extension/delta ring/barrel nut
    • float tubes (if used)
    • gas tube (technically not the same but you can use an AR15 gas tube in an AR10 without an issue; dunno if the converse is true)
    • ejection port cover and pin
    • bolt, carrier, firing pin, cam, cotter pin, extractor
    • pistol grip
    • trigger group (close, but not exact)
    • most all other lower parts not listed below
    • buffer (AR-10 buffers are dimensionally different to allow a longer BCG travel)
    • buffer spring (the AR-10 uses a AR-15 length spring of a higher spring rate)
    • magazines, followers, springs
    The same:
    • trigger guard
    • magazine release button
    • gas block/front sight tower
    • A2 stock/buffer tube
    • front sight post and A2 rear sight assy
    • handguards
    • most any 1913-based add-on (BUIS, etc.)
    Dunno - never checked:
    • gas rings (probably not)
    • extractor spring
    • front sight spring/detent
    • ejector plunger and spring
     
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