Beach in your other thread you have going....you got buffer tube,buffer,detent,spring problemos
so being me I always go back to square one.....a well built ar308 should work with a car 308 spring and car 308 buffer and car buffer tube in your piece....no fancy stuff required....dont be spending big bucks until you sort out your probs first.....dont add variables to the equation right now........you dont know right now if your undergassed overgassed......or just passing gas....lol
:) Wash