I recently bought a 1877 12ga underlifter that needed some TLC. The barrels were slightly off face. Not having any shim stock at the time, I cut a piece of copy paper and used it as a shim. The paper mic'd out at .004 and the gun was perfectly on face. I got some shim stock, the .003 was too big, the .002 was too small. I greased up the paper shim, shot 100 sporting clays and the gun was still tight. It doesn't open as smoothly as if it were metal to metal but not bad. Talk about a cheap fix. I'll test it and see how long the paper shim lasts!
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