Teaching Myself CAD Using FreeCAD

Grabbed a copy of FreeCAD and went to work today teaching myself from scratch.

I couldn’t do any old project so I drew up a trunion for an AR-180B.

I reverse engineered the dimensions from my original upper I found it to be a lot of fun.

Just a quick picture.

AR180B Trunion


The hole takes a modified AR-15 barrel extension, just like the original 180B.

I am still not sure how the original was retained other than a press fit.

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