Gun Digest

Gunsmithing Mistakes: Avoid Making These Common Errors

The truth is that most gunsmithing can be accomplished with a handful of useful tools.

Countless firearms, old and new, bear the marks, burrs and gouges that are the result of using the wrong tools for taking them apart. Here are several common gunsmithing mistakes to avoid.

In the interest of preventing this sort of thing, Kevin Muramatsu shares a few gunsmithing basics, from the most recent edition of the Gun Digest Book of Rimfire Rifles Assembly/Disassembly.

Screwdrivers: Always be sure the blade of the screwdriver exactly fits the slot in the screw head, both in thickness and in width. If you don’t have one that fits, grind or file the top until it does. You may ruin a few screwdrivers, but better them than the screws on a fine rifle.

A note on coin-slotted screws: Many action takedown screws and main stock retaining screws have slots designed for use with a coin, the theory being rthat a shooter in the field might not have a large screwdriver at hand, but would be likely to have pocket change. The slots in these screws are wider than normal, and the floor of the slots will be curved, to match the curve of a coin edge. It is possible, and advisable, for the gunsmith or advanced amateur to alter a large shop screwdriver to exactly fit these screws. In general, though, the following advice applies: Do not use an ordinary, unaltered large screwdriver on coin-slotted screws.

Slave pins: There are several references in this book to slave pins, and some non-gunsmith readers may not be familiar with the term. A slave pin is simply a short length of rod stock (in some cases, a section of a nail will do) which is used to keep two parts, or a part and a spring, together during reassembly. The slave pin must be very slightly smaller in diameter than the hole in the part, so it will push out easily as the original pin is driven in to retain the part. When making the slave pin, its length should be slightly less than the width of the part in which it is being used, and the ends of the pin should be rounded or beveled.

Sights: Nearly all dovetail-mounted sights are drifted out toward the right, using a nylon, aluminum, or brass drift punch.

One last tip: In gunsmithing, brute force is the enemy. If it doesn't come out with a light tap, there is probably a good reason – like a set screw, or you are trying to tap it out the wrong way. “Getting a bigger hammer” is generally not the solution in a gunsmithing situation.

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