Please do change from mpa to fpe. I have no idea.Hey man, you sure you have that spring guide in correct and using the spring guide that fits the spring?When I first tested with full length spring I can get 3 turns in without bind?
I hung it up too when installing for the first time. Didn't think it was gonna fit until I fiddled with it.What weight slugs or pellets you running?Does the cap seem to be holding up?Your making me want to run a few through my gun.