Started 2 new 308 budget builds. Used PA-10 receivers, 20 in barrels, rifle gas and adjustable gas blocks, used A2 stocks with standard A2 buffer and spring. Rifle keeps short stroking. Ejects brass at around 4-430 position. Finally got it to eject and load next round but will not lock back with gas port all way open. Think a buffer spring swap is in order? Cycles with hand and locks back easy. Just not while shooting. Both rifles the same, identical components, tried Hornady, Winchester, Federal, Ultramax ammo. Any ideas guys?