Remove any magazines, clips and ammunition from the weapon before starting work. Make sure the weapon is empty and safe to handle before starting.

Locate the drilled-and-tapped accessory mounting points on the receiver or forearm of the weapon. Look for two or more small holes spaced evenly along a straight line. The holes may or may not have screws inserted in them as plugs to seal out debris and dust.

Remove the screw-in plugs, if necessary, from the drilled mounting points. Use an Allen wrench to loosen and remove the screw-in plugs.

Place the Picatinny rail over the drilled and tapped mounting points on the receiver or forearm. Line up the holes in the rail with the holes in the weapon.

Insert threaded Allen head screws through the Picatinny rail and into the drilled-and-tapped accessory mounting points. Turn the Allen head screws to the right or clockwise to thread and tighten.