Crescent Arms 12 Ga Hammer gun

[Bingo]

This old piece is loose. There is a rectangular piece of steel on the under side of the barrels that has a curve cut in it to ride on the pin in the receiver. This curve appears worn.
   Can the pin be easily replaced and would it be OK to add (weld ) a little metal to the curve then ether machine of grind it out to get a snug fit on the old gun?
    Numrich has parts for the gun.
   

[gunnut69]

Welding om the barrels of a double will usually generate enough heat that the solder joints will fail. That's NOT a good thing. I'm not familiar with the piece in question but it was installed once so could likely be replaced. The Normal fix is to shim the half round,(piece on the barrel) soldering shim in place with low temp solder, then re-cutting and setting the headspace. This assumes the pivot pin is still round. If not it would need replacing. This is not a job for the amateur.

[Nessmuk#1]

The permanent fix is to have a new pin installed.  Brownells sells a kit to do this, but it is really a job for a smith with good equipment.  I have one of these, an old family piece.  These are very difficult to get parts for, but were manufactured under about (no joke) one hundred fifty different names for any hardware store that wanted one in their own name.  Value on a Crescent runs a hundred to a hundred fifty bucks.  As a family piece like mine their priceless.  If it's a wound, spiral steel barrel, I wouldn't shoot it.  Also, the chambers may be of the short variety, for 2.5 inch shells or shorter.  Measuring the chambers won't tell the whole story as the shell needs room to open the crimp in the front.  Again, something for a smith to check.  Old length shells are available, more so since the cowboy shooters have become more numerous.  Good luck and enjoy!

[gunnut69]

If the pin worn out of round it must be replaced. This is done by either pressing it out or drilling it out and the kit Brownells sells has a reamer to both round the hole and the half round on the barrels at the same time. As a 12 it is very unlikely to be a 2 1/2 inch chamber as the 2 3/4 has been a standard for many years. The 16's and 20's are a different matter. The steel referred to in the prior post is damascus and it's danger is a debated item. Most gunsmiths will advise against shooting them but many folks do. God watches over fools and little children... If the pin is not worn bushing or shimming the half round is the way to go. It's considerably cheaper and just as effective.

[trotterlg]

Had and old H&R that was loose, I knocked the pin out, rotated it 180 Degrees putting the warn side forward, knocked it back in and everythign was wonderful again.  Larry

[EdinCT]

 Some folks take a prick punch and punch around the circle to tighten them up. A new pin is the best solution though.

[gunnut69]

Don't punch the half round. It doesn't last as long as it took to do and it will detract from the guns value. A low temp soldered on shim is the fix of choice for a worn ha;f round but that will need fitting and that makes it s job for a pro or a talented amateur..