- 1). Mark cutting points and lines on the aluminum corresponding to your blueprints. Essentially, you're drawing out the shape of the receiver per the schematic of the model you're building.
- 2). Place the aluminum block on the mill. Run the mill to cut along your marks and machine away the material until you have the rough receiver shape matching the measurements of your schematic.
- 3). Flip the block over. Make the opposite side marks and cutting lines according to the blueprints. Note that both sides of the receiver aren't identical. Repeat the milling process on this side.
- 4). Set the block in soft jaws or padded jaws on the rotary table. True up the sides, mill out the body and fine-tune the angles according to the blueprints. Cut the receiver along the half line to form the two upper and lower receiver sections. Deburr and shape the rough cut edges from milling with a rotary tool and sanding drum. Finish hard corners and edges with a rat-tail file and mill bastard file.
- 5). Drill and tap holes on the lower section using a drill press. Hand tap for the trigger group and safety selector pins per the blueprints. Drill and tap holes for rear sights or scope (whichever you'll be mounting) on the top of the receiver. You're now ready to test fit mechanical parts and finish or paint the receiver.
SHARE
