I read a lot of tosh about the ASG CZ P-09- front sights falling off etc. Turned out to be a load of twaddle
Set mine up with a red dot via a rail and it has shot perfectly. As someone will be along soon to tell you, it does not "lock back after the last shot" and neither does it have a "cut out ejector slot"...but being a .177 pellet shooter it can't lock back, neither does it need an ejector slot..as nothing is ejected
Vis a vis the Sig I cannot comment, but it shoots well enough