Decided today was a good day to gather up my crew and spend some time on the range. I brought my Mosin Nagant, PSL and 3/4 spam can of ammo. The Nagant gave me no issues and shot like a champ,the PSL was well....another story. I fired 2 rounds and the mag fell out, slapped it back in and repeat. Eventually I got it settled in and realized after maybe 20 rnds that the entire scope mount had slid forward about 1/4". Has anyone ran into these issues before and what will it take to cure these problems?