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AR-15 80 Universal Lower Receiver Milling Jig

Sp0z3n Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International 106.3KiB Released February 7, 2025, 11:54 PM 0.010LBC 2 Reposts

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This Jig is meant to be used for 80% Arms Gen 1 self-aligning milling jig for making the proper cuts on a AR15 80% lower receiver. The alterations I made on this jig were that I removed the magwell bumps to accommodate all non-milled wall magwell billets. The original post had magwell vertical walls which would only fit slim magwell walled billets. I printed mine with PLA matte but tested with PLA+ and ASA successfully.

For milling instructions on how to use this jig, There are instructions available. I found it in minutes in a PDF explaining everything. Sorry I cant post it here

Print Settings

Rafts:
No (brim on spacers)

Supports:
Yes

Resolution:
0.16

Infill:
25

Filament brand:
PolyMaker

Filament material:
PLA, PLA+, ASA

Notes:
Be sure to print with proper settings to minimize warp in whichever filament you choose to use for this, as you need for everything to be precise. Supports are necessary for some of the side holes. Use as low of an infill as possible for these supports to make them easy to remove.

Additional hardware:
-Router
-(4) 4.5-4.8mm bolts with nuts and washers for takedown through-holes (the tighter the tolerance the better)

LBRY Tags: ar15; jig; milling; gun; airsoft