003' basically, ANY noticeable fore-aft movement of the cylinder is bad, and is usually accompanied by an increase in headspace. 050' are necessary for total reliability.)Īlso, check the cylinder endplay. (I've found, however, that measurements above. Other causes can be a compressed firing pin check the protrusion, which should be in the range of. If that doesn't solve the problem, pull the hammer out and thoroughly clean its pivot hole, and the frame pin on which it rides. If this is the case, application of a solvent (acetone, naptha, etc.) to the firing pin will usually loosen it sufficiently. This is an area where dirt and grime build up, and can bind the firing pin the resultant drag on entering the frame can slow the hammer enough to cause light hits.
The firing pin on the Trooper is normally on the hammer, and needs to pivot freely to work properly. Since it's a cheap part, and should be changed occasionally anyhow, I'd go ahead and replace it. 357 Trooper uses the same mainspring as a Python.
