The Sig Mosquito is an interesting little gun. Accurate as all get out. It's reliability is a little questionable though. It's only had like 20 rounds through it too though. I'll be fixing that tomorrow. I think the main problem with it not wanting to feed rounds is the way they made the feed ramp. There's a little "step" between the ramp itself and the barrel. And why Sig would design it that way is beyond me. May take it somewhere to get the ramp polished and have that "step" taken out. Can see it being an ammo hog after that.
Thankfully, I bought it was a backyard plinker/target gun. So it jamming once in a while isn't a concern to me. I'm also feeding it Winchester white box. Believe CCI is a higher velocity, and that is the brand Sig recommends. May try to pick some of that up tomorrow as well. The gun also came with a guide rod spring for non-high velocity loads, so I'll be giving that a spin tomorrow too.