Calvin, I agree that lack of routine cleaning under the extractor can easily compound wear to the barrel hook.Cleaning that area is vital. The specific reason for the off face condition is due to different hardness between bearing surfaces. The reciever and hinge pin are heat treated, the barrel lug hook and dolls head are relatively soft and are not treated. Upon firing the inertia placed on the barrels is a forward stress or movement. As this stress occurs, the softer metal will yield and compress to the harder metal. Thus loose on face.
Shimming and hinge pin replacement are at best, temporary fixes. The only best fix is to increase the metal at the hook radius. Due to the barrel lump brazing and rib soldering, high temps need to be avoided. Lazer welding is the only, low temp process "radiating heat", that protects the surrounding areas.
Lazer welding is the only welding that is totally controllable in penetration and build up thickness. The steel in the fill material is harder that the original steel, extending the life of the fix.
Refitting the barrels and extension should only be done by someone that is well versed in this process. The fix should cost you between 3 and 4 hundred bucks, well worth it considering the extended life to the gun. Also the fix should be totally undetectable. It can be done.
Brad
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