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Ive never had a problem with pmc short stroking or anything else. I shoot TULAmmo and dont have any problems. Id look for a lighter buffer spring.
Thought I would update this post, I did finally get a chance to test out my rifle again, not a lot of options in State College for ranges so it took a while to get out.
Anyways, I kept the blue Sprinco spring and swapped in an H buffer, works perfectly now locks back correctly every time.
Now I just need some range time to enjoy my new rifle. Thank you all for your input, as always this site is a wealth of great info.
Yes the H2 was too much. Did not get a chance to try different ammo yet, I just got an order of Federal XM193, its going to be a while until I can get out to the range again though.