Quoted:
Do you use a standard ar15 buffer tube for an AR10?
Q: What parts from an AR-15 can I use in a .308 rifle?
A: (from the AR-10 FAQ)
Pistol grip
Ejector/Safety spring
Safety detent
Buttstock screw (A2)
Buttstock Assembly (A2)
Buttstock Assembly (A2)
Buttstock spacer
Detent spring
Detent (2 per rifle)
Bolt stop pin
Bolt stop plunger
Bolt stop spring
Mag catch button
Mag catch spring
Safety selector
Rifle receiver extension
Disconnector
Disconnector spring
Standard Trigger
Trigger spring
Hammer
Hammer spring
Hammer and trigger pin
Trigger guard pin
Trigger guard assembly (on some rifles - others have built in trigger guards)
Buffer detent
Buffer detent spring
The AR-15 Bolt catch should work on KAC/DPMS type lowers, but not AR-10 type lowers.
From DnPRK: Most AR trigger assemblies will fit an LR-308. The two triggers that require modification are 1) the Chip McCormick straight trigger which needs th end of the trigger clipped to clear the trigger guard and 2) the RRA trigger which might require the tip of the cocked hammer to be clipped to prevent it from dragging on the bottom of the bolt carrier.
An AR-15 rifle buffer tube will fit an LR-308, but you need the 308 rifle buffer and spring.
A CAR-15/M-4 collapsible stock buffer tube will fit an LR-308 but you need to use a Slash shortened buffer and 308 spring, or use Armalite's collapsible stock buffer, tube and spring for the AR-10 carbine.