That's your slide buffer.
I'd also suggest polishing your throat and chamber. I use Cratex x-fine rods with a Dremel, you can also make do with a Q-Tip (with one end chopped off and chucked in the Dremel) and some lapping compound.
Most folks find that standard velocity .22s cycle best. Stingers tend to beat these little guns up pretty badly, but are okay to carry as dog/biped repellant.
I'd also suggest polishing your throat and chamber. I use Cratex x-fine rods with a Dremel, you can also make do with a Q-Tip (with one end chopped off and chucked in the Dremel) and some lapping compound.
Most folks find that standard velocity .22s cycle best. Stingers tend to beat these little guns up pretty badly, but are okay to carry as dog/biped repellant.