Originally Posted by
BufordTJustice
...then I say the educated troubleshooter has to start asking the question "why won't my gun run with a rifle buffer/A5?"
Because it was not designed to. It was designed to function with a H weight carbine buffer.
I have a buddy who bought a CMMG piston AR back in 2008.... It still NEEDS a a BCM extractor spring WITH the o-ring and insert to extract properly, but yet will malf with anything heavier than a carbine weight buffer.
Several DI guns need buffers of varying weight and an extractor spring...
Why deviate so far from the original design, only to have slightly more muzzle rise, a sharper recoil impulse, and no more resistance to dirt/carbon?
I would say it is good advice if he did not already own a piston upper that he can get functioning properly for little or no money by changing weights in the buffer. I would even advise converting it to DI by buying a gas tube, gas block and bolt carrier before I told him to dump the whole upper. He could sell the piston kit and pocket some money instead of laying out more money.