My TPH is an American made stainless from InterArms in what looks like near NIB shape! I had read about severe jamming in the InterArms American made Stainless 22lr TPH's and, was, therefore really worried when the gun jammed (stovepiped) at least once every mag of 6 rds when using Federal "Hi Velocity" LRN Champion's. I then tried CCI Mini-Max's FMJ with NO failures over 200 rds! I then tried Remington's LRN Thunderbolts with NO failures over 200 rds. Went back the Federal "Hi Velocity" Champions to make sure that the gun didn't just need breaking in and got jam city again! Even tho the Federal Champions are called "Hi Velocity", I could feel a MUCH lighter recoil from them than the other two. So much for their "Hi Velocity" description! I then shot some more CCI's and Thunderbolts without failure, but had to stop due to severe Walther bite! I'm glad that mine is NOT a Jam-O-MAtic and functions well with hotter ammo!