MK 1 ejection problems

Dad gave me his MK 1 (actually a standard, I think) and I fired it yesterday for the first time. The 9 cartridges that he had in the Mag fired and ejected just fine. Once I switched to a new box of ammo (federal) I had problems with the gun not ejection the spent round. It would eject every once in a while, but for the most part, I had to slide the bolt after every shot.

I broke the gun down and cleaned it (not quite as bad as I had feared) and have not had the chance to fire it since. Does it sound like a cleaning issue, or should I look for a shop to check it out?

I wouldn't be surprised if it's an ammo issue. I would try several different different brands and see what feeds through your gun best. It seems that .22 pistols are pretty finicky with ammo.

It's too early to determine anything.

My MKII is not picky with ammo at all, but that doesn't mean yours isn't. I practically never clean mine either, and that's with multiple boxes of rounds through it with no issues. Again, that doesn't mean your experience will be the same.

I wouldn't worry about it until you shoot it since the cleaning/lubing and try a few different ammos.

Report back after you've done these things...

Just got back from the range. I bought a box of high velocity cartridges and they performed fine. I guess the gun needs a bit more umph to actuate the bolt. Upside is that now I know how to take down and put the gun back together