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Making an AR15/M16 Bolt Stop Extension
Now that I have a center-drilled hole, I can radius the big end.
Ý Ý Ý The radius cut is made by rotating the part around a pin set in a fixture while cutting.
The final milling cut is to narrow the lever arm. This is done while holding the piece in a clamping fixture.
Then three holes are drilled into the lever, each one is first center drilled and then drilled through using a #29 drill.
And finally, the first and last hole are threaded ( 8 x 32 )using a tapping device in the drill press.
Then the pieces are placed in a vibrator "tumbler" along with some "Black Beauty" blast media for about 48 hours to remove burrs, sharp edges and what not.