Mauser Action Truing

The action of the Mausers has stood the test of time. It has proven that it is one of the most Safe, reliable and accurate firearms ever built. Although to achieve a precision rifle and to greatly improve on the mausers accuracy the action can be trued. Which consists of squaring the Receiver face, lapping the bolt lugs and lapping the bolt face. The lapping can be done at home with the proper tools and knowledge, however Squaring the Receiver face needs to be left to a skilled gunsmith with a metal lathe.

Lug Lapping - The Mauser bolt lugs locks in the receiver when closing . The amount of metal that makes contact between the bolt lugs and receiver is where lug lapping comes in . Lapping the lugs provides more metal to contact the lugs and receiver and improves the squareness of the mating of those surfaces. It is accomplished with a lug lapping tool available from MidwayUSA [ click picture to see tool on Midways website,] or your favorite gunsmith supply store. It works by threading the lapping tool into the receiver [ the threads for the barrel ] and applying compound to the lugs of the bolt and rapidly opening and closing the bolt. This increases metal to metal contact and assures the lugs are both firmly against the receiver when the bolt is closed.

Bolt Face Lapping - The face of the bolt is where the head of the cartridge makes contact with the bolt. By lapping and squaring this surface it insures that the cartridge is in full contact and stress free and in-line with the chamber of your barrel. This is performed with a bolt face lapping tool also sold by MidwayUSA [ click picture to see tool on Midways website,]. By inserting the bolt face lapping tool into the threads of the receiver with the bolt closed and applying compound to the face of the bolt a hand held drill rotates the tool and squares the face of the bolt improving accuracy greatly.

Squaring the Receiver Face - The receiver face is the metal that comes in contact with the shoulder of the barrel [ which is the surface the barrel mates with allowing the barrel to be tightened]. Squaring this surface insures when the barrel tightens up it is 100 percent squared and inline with the receiver. This is accomplished by putting the receiver on a mandrel [ click picture to see tool on the MidwayUSA website,] and using a metal lathe remove as little as possible of metal to insure the face is squared. As stated above this is best left to a competent gunsmith even if you have a lathe as the smith will know the tolerances of the metal and not damage the heat treated [ hardened ] surface.