if you mean the 10 shot mag conversion they can have problems if not correctly fitted, the indexing system that turns the mag can get bent, the mags are not the best quality, i would suggest you take off and check all parts if every thing ok replace with bolt through then tighten holding screws, once it aligns good after you trial without pellets, use pellet lube and they are better with shorter domed pellets, good luck from the oldy