Drop them in the jar and fish them out with a magnet a few minutes later completely degreased. The screws should also be degreased, and I keep a glass jar of lacquer thinner on the bench for this purpose. I use Shooter's Choice Quick Scrub III as a general degreaser. If everything looks good degrease the tapped holes and the top of the slide. We don't want burrs inside the tunnel interfering with the firing pin. After all four holes are drilled and tapped, check the firing pin tunnel for burrs and clean it up with a chainsaw file as necessary. We drill down through the thick part of the slide into the firing pin tunnel and stop. The third hole is 2.350 inches from the second one and deeper. Now we move the table over 1.775 inches for the second hole and repeat the same procedure. Then we install a tap guide in the chuck and tap the hole by hand for 6-40 threads.ĭrilling and tapping before we move the table insures everything is in perfect alignment. After spotting the hole, we change to a #33 drill and run it straight down through the slide.
Spotting the hole is important, since we are drilling on a curved surface and we don't want the drill to walk off the center line. 980 inches from the muzzle, so we move our mill table over that distance and spot the hole with a center drill. The rail has a taper, so I set the rail on the slide and level it with a machinist's level.Īttaching a pair of centerline gauges to our digital caliper, we take the necessary measurements. Clamp the slide in the mill vise and level it. We also want to remove the firing pin and firing pin spring, since we'll be drilling into the firing pin tunnel. We begin our installation by removing the iron sights from the Springfield Armory slide.
Machined from aluminum, it is attached with four 6-40 socket head cap screws and provides a clean, low profile installation. Mounting a scope rail to the 1911 slide isn't difficult, but you have to pay careful attention to locating the screw holes. Shooters who would have retired from competition in their '50s are shooting into their '70s. The advantage of a red dot over iron sights for older people like myself with poor eyesight is that we are no longer required to focus on the front sight to shoot good groups. Suddenly, everyone was running red dots on their. NRA Conventional Pistol or bullseye pistol competition was always about shooting iron-sighted pistols and revolvers until a couple decades ago when the NRA changed the rules to allow non-magnified optics.
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