AR10/AR15 Part Commonality


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NorCalRifleman
February 27, 2007, 02:16 AM
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.

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Zak Smith
February 27, 2007, 02:30 AM
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
February 27, 2007, 10:36 AM
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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