AR-15 Lower Receiver Completion Guide Drill Jig
Load the 1/4" end-mill and set the final milling depth as before in Step 15. 18. Route out the trigger slot using the routing pocket as a guide. Move the cutter around the pocket in a clockwise direction (conventional milling direction). Note: The Trigger Slot Top Plate routing pocket is design for a 1/4" end-mill with a 3/8" shank. 19.
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