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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

    Aug 5, 2006
    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?

  2. Zak Smith

    Zak Smith Moderator Emeritus

    Dec 24, 2002
    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

    Jan 21, 2004
    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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