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THIS IS MAINLY FOR THE 80% CASTINGS BUT 80% FORGINGS NEED NOT SO MUCH WORK AR15 BUILD THINGS NEEDED TO DO Front pivot pin - hole drilled with 1/4" Rear takedown pin - hole drilled with 1/4" Trigger pin - hole drilled 5/32 Hammer pin - hole drilled to 5/32 Selector - hole drilled to 3/8 Bolt hold-open plunger drilled with 5/32" to a depth of .470" Trigger guard - left side - drilled with 1/8" through both ears Trigger guard - right side - drilled with 1/8" through only one ear Front pivot pin detent - hole drilled with 3/32" to 1.125" deep Rear takedown pin detent - hole drilled with 3/32" through to detent pin hole Selector detent - drilled through to selector with 1/8" then countersunk with 5/32" Bolt hold-open pin - hole drilled to 3/32" with 6" aircraft bit Stock index hole - drilled with 1/2" Grip hole drilled - with 7/32" Buffer stop plunger - hole drilled with 1/4" to .712" deep Fire control well milled - by .030 with a 3/8" end mill - optionally shave down your parts to fit the undersized pocket. Rear takedown well milled - by .030 with a 3/8" end mill - optionally shave down the rear lug of the upper receiver to fit the undersized pocket. Buffer hole reaMed - to 1 1/8" Buffer hole tapped to -1 3/16" with 16 tpi Rear takedown pin relief - cut with a 3/8" end mill Grip hole tapped - with 1/4" By 28 tpi HOPE THIS HELPS OR GO HERE FOR MORE INFO: http://www.homegunsmith.com/cgi-bin/ib3/ikonboard.cgi WILLAIM |
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