I recently purchased a glock 36 from a guy on armslist. Well, I went out today to sight in another gun and the last few minutes before dark I fired two magazines through it. The first three cartridges were federal hydrashocks, until I realized I was shooting the good ammo, and switched to tula. About every 3 I fired, was a failure to fire, and one failure to eject. Does it sound like an issue with the gun? Maybe it hasn't been broken in yet? Thanks for any feedback!!