we have considerable experience with colt-type replicas that try to function in a semi-auto fashion. The back pressure coming through the nipple knocks the hammer partially back and begins to rotate the cylinder. this frequently interfers with smooth functioning. A couple of fixes sometimes eliminate the problem. A heavier mainspring or replacement nipples from Treso may fix it very well. Other times the problem persists no matter what.
Bates has a uberti 51 navy that resisted the first two fixes. He then observed that the cylinder begins to move with the slightest backward motion of the hammer. He relived the radius on the "ear" of the locking bolt to delay contact with the hammer cam. Now the hammer will move back a little bit before engaging the cam and unlocking the cylinder for rotation. This is something that does not require much metal removal and can undoubtedly get screwed up if you go to far.
the hammer is still coming back a bit at each shot but the cylinder remains locked until he manually cocks the hammer. Very smooth functioning revolver now.
the area marked cam release
Bates has a uberti 51 navy that resisted the first two fixes. He then observed that the cylinder begins to move with the slightest backward motion of the hammer. He relived the radius on the "ear" of the locking bolt to delay contact with the hammer cam. Now the hammer will move back a little bit before engaging the cam and unlocking the cylinder for rotation. This is something that does not require much metal removal and can undoubtedly get screwed up if you go to far.
the hammer is still coming back a bit at each shot but the cylinder remains locked until he manually cocks the hammer. Very smooth functioning revolver now.
the area marked cam release
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