This gun came out of the CMP program, and I'm the second owner. It has about 1,200 rounds through it.
I've had this rifle since 2006, and have gone from marksman to expert in NRA highpower competition.
During this time, I've used USGI LC M855 for my rapids, and Brit SS109 for standing and slow prone. The rifle functions 100% with USGI Lake City...and has short stroking issues with the Brit (and every other loading of .223 I've tried - Remington, WWB, Wolf and now Prvi). I've recently purchased 1k of 75 grain Prvi Partizan, and used that in the last match. It functioned better that most others, but still not good enough to shoot in rapids without me worrying.
About a year ago, I had it "debanned", replacing the front sight tower and threading the barrel for a flash-hider. The issues did not go away.
I'm getting low on my LC M855, and would like to resolve this issue so that I can shoot whatever I have, and specifically the Prvi 75, through the gun without worrying whether I will get to practice my immediate action skills.
I've noted no excessive/unusual wear on the BCG. Can a simple buffer spring replacement solve this? Would lighter be the way to go (or heavier because of pressure issues)? Can I snip coils off the spring, or is that bad? Or should I bite the bullet and buy a whole new b/bcg assembly? It still has the stock bushmaster 2-stage trigger in it (which does not work well with M261 .22 conversion) - could this be causing excess drag on the carrier?
Any ideas are appreciated...