Forget the SIG ,one of my camper's has it,he's a retired Marine, and it ONLY fire's with CCI,he called SIG about sending it back and they told him if it shoot's CCI just fine they/SIG will NOT work on it with out charging him,Im not knocking SIG here,this is just a head's up for you,this is a known issue with this .22 from SIG,Im sure someone will chime in here with more,I like the Ruger Mark's, I've had a 1996 M2 slabside 6 7/8 inch goverment model in blue that i loved BUT i screwed up by putting that quick strip kit in it,the gunsmith could not get it to fire right so i sent it back to Ruger and they put it back to original, replaced everything except the hammer and it still missfired, it would not dent the case enough to fire, forget the quick strip kit for the ruger M's,i ended up tradeing for a new M3 hunter in stainless, just know i find Ruger's a bear to put it back together after cleaning BUT that is an issue for me,NOT the gun,i just need to learn how it's done.