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GUNS Magazine April 2013 Digital Edition - Page 34
QUESTIONS aNd aNSWERS JEFF JOHN DisassEMblY GUiDEs I have just become a gunsmith through the correspondence course from Penn Foster Career School. Although I grew up with guns, I have no real hands-on training, yet do good work cleaning, redoing stocks and mounting scopes. A friend brought me his father’s old .22 LR Mossberg 151MB for repair. It is very special to him because his dad was a highly decorated Korean War veteran. My problem is I have no schematic to work from although it looks like Numrich may have the parts I need. Can you direct me to a source for a schematic? I hesitate to just start taking it apart without some directions. Charles Thorpe Salineville, Ohio Q: DRop safE? If a 1911 with a loaded chamQ: ber is dropped, which is safer: hammer down or cocked and locked? Gary D. Miller Bean Station, Tenn. Both methods are drop safe— A: if—your 1911 is properly maintained with a strong firing pin spring. J.B. Wood has been writing the Gun Digest Firearms Assembly/Disassembly books for decades. Current editions are updated by Kevin Muramatsu. As a new gunsmith your best A: friend are the Gun Digest books written by J.B. Wood on fire- arm assembly/disassembly. J.B. started doing these books in the late 1970s and you may just find less expensive used copies at a gunshow. The books are currently edited by Kevin Muramatsu, a topnotch gunsmith in his own right, and Rimfire Rifles Assembly/Disassembly still contains the directions for disassembling the Mossberg 151M. I do a little gun work myself, and I found J.B.’s pioneering series a must-have for my library. I bought mine one at a time as I needed them. You should consider doing so, too. F+W Publications Gun Digest Books 700 E. State St. Iola, WI 54990 (800) 258-0929 www.gunsmagazine.com/gun-digest Numrich Gun Parts Corp. 226 Williams Ln. West Hurley, NY 12491 (845) 679-4867 www.gunsmagazine.com/numrich The firing pin is of the inertial type, meaning the pin itself is shorter than the tunnel in which it resides. When the hammer strikes the pin it flies forward through the pin hole in the breech and discharges the cartridge. If the 1911 falls on the hammer, the pin won’t have enough momentum to travel—unless it is on the 1/2-cock notch. The notch will fail and the hammer may hit the firing pin hard enough to discharge the pistol. If the firing pin spring is weak, and the 1911 is dropped on the muzzle, the firing pin can fly forward with enough force to discharge the cartridge. Many 1911s made today come with some type of safety to prevent this. The Kimber II has a safety that unlocks the firing pin when the grip safety is depressed. Lightweight titanium firing pins are good way to upgrade older 1911s. If your 1911 doesn’t have one of these safeties, it is best to change the firing pin spring every time you change the recoil spring. Wolff Springs routinely sends along an extra power firing pin spring with a recoil spring for the 1911. As an aside, lowering the 1911’s hammer on a live round or using the half-cock notch is an accident waiting to happen. Carry the 1911 cocked and locked or with the hammer down on an empty chamber. Brownells 200 S. Front St. Montezuma, IA 50171 (641) 623-4000 www.gunsmagazine.com/brownells Kimber 1 Lawton St. Yonkers, NY 10705 (800) 880-2418 www.gunsmagazine.com/kimber Wolff Gunsprings P.O. Box 458 Newtown Square, PA 19073 (610) 359-9600 www.gunsmagzine.com/wolff-springs Got a burning question to ask the editor? Contact him at: E-mail: ed@gunsmagazine. com or postal at: GUNS Q&A, 12345 World Trade Dr., San Diego, CA 92128. Due to the volume of mail received, GUNS cannot offer a personal reply. 34 W W W. G U N S M AG A Z I N E . C O M • A P R I L 2 0 1 3