This weekend, I am going to try the MG42 again to try to solve the case separation problem.
Last time, Of my 5 barrels 7.62 Barrels, 3 barrels had no case separation, 2 barrels had case separation with both Lake City and Malaysian. I want to verify the three barrels that tested good and see if any of my changes help with the other 2 barrels.
I inspected those 2 barrels, gave them a good cleaning, tested headspace again. They look clean and smooth.
Also, I swapped out the following parts, will any of these changes make a difference?
- MG3 HK Marked Cam Piece, ("RTG Description "MG3 TRUNNION COMPLETE")
- MG3 BARREL BUSHING (MGG-0901) (Has a groove, looks different longer?)
- MG3 RECOIL SPRING NEW (MGG-1824) NEW in the WRAP
- MG3 BW BUFFER NEW IN WRAP (MGG-1774), also got the stock
The Recuperator Spring was rebuilt by Bob Naess a few years ago.
I am currently using the current production MG3 Bolt Catch/Stabilizer with the short current production ejector bar.
Question on Bolt Catch/Stabilizer: If I used the early type bolt catch with the longer ejection bar, would that allow a little more time for the case to shrink away from the chamber walls and help prevent the case from sticking and separating?