My dad gave me his old 30 carbine to see if i could get it back functioning correctly. It will not go into battery with a full mag or one thats mostly full. Im using a 15 round mag and 110 umc fmj. If the mag has only 8 or 9 rounds in it it works fine.
I put a new recoil spring in and that did not help. Seems like the full mag is putting to much pressure on the bolt and slowing it down so that it will not go all the way forward.
Is a us postal meter gun. WW2 I assume.
What do I need to do? Try new mags? Weaker spring in mag?