I love my Optima NW. Never had a problem with it to date. You'll see some on here with problems having the musket caps going off. I contribute that to the fact that RWS caps are thicker and do not fully seat on the nipple. I got a new tin of them yesterday and had 4 not fire, I used a knife and slightly spread them open on one of the slits, each one went bang after that. The RSW musket caps fit super tight compared to CCI and sometimes will not fully seat,causing a click, no fire kind of deal. Add fouling to the nipple shaft and then you got a really tight fit!