Quick set on d2 lpr. Air up your gun, cycle it with no paint. Turn down lpr to start. Watch the bolt in the breech. Turn it up till it clears the breech, firing every 1/4 turn, then about a half turn extra. Not perfect, but it will work. Watch it, though. The stock lpr is known to creep! Keep track of where you set it. A small reference mark with a sharpie marker works.