AR10/AR15 Part Commonality

[NorCalRifleman]

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.

 

[Zak Smith]

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.

 

[rbernie]

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