I have three 9mm/40 arredondo mag pads, in the 9mm it will only hold 22 rnds. (I'm happy with this). In the 40 it will only hold 18 rounds and some times the rounds get hung up in the mag and won't come out. I've used the L shaped insert, the flat insert and the metal stock insert with the same problem occuring. I also use the stock mag spring. Any advice.