Does the gun try to re-cock? If it does then you need to lower your hammer lug a touch, to do ghis take the bolt out and find an allen key that is the same as the gripframe screws, put in the hole behind the feedneck and screw in a quarter turn at a time and re-test.
If the gun doesnt try to re-cock see below.
As you look at the gun from the front on, the part on the bottom right of the front pneus is the lpr. Does that have a knob on it? if so screw it almost all the way out then slowly screw it back in whilst cycling the gun to get it to the point where it re-cocks reliably then a touch more for extra reliability.