Yes the mag, im at that stage now!! My legs are getting bruised! Same here the accuaracy is spot on, and i have a good silencer.
Did think about taking the mag apart, but i wont bother now.
Im using Elly Subs, did use winchester for a while but i couldnt get on with them.
Common problem then. I've had the rifle for 6 years, and changed 2 mags for this problem.