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There is three versions one with a printed shelf, one with M3 hardware to adjust to your setup, and one with a spring which should work with any setup you drop the housing into. Use some kind of adhesive if your spring fits loosely.
Use high number of walls or 100% infill. Smaller layer heights will print better holes. No supports necessary. Print in PLA+ or PLA Pro.
Update 4: New version for people that are having trouble finding a 4.5mm pen spring. Uses these springs https://www.amazon.com/dp/B076M55S7F, if they are out of stock, the specs are Outer Diameter: 4mm/0.16 Wire Diameter: 0.4mm/0.01 Total Length: 10mm/0.39
Update 3: Added a version that uses a 4.5mm pen spring. I cut mine down to 10mm long but you can cut to the length you need. Press fit into the hole, clean up the opening if needed depending on your bed texture. Depending on your print accuracy you might need some glue to hold the spring in if it falls out easily.
Update 2: There was a problem with the screw hitting a lip on some upper receivers. I added a model that angles the screw 15 degrees to clear it. Use this model if you have problems closing the upper or if it's hard to turn the safety to the FRT position.
Update 1: Added a second model that uses M3 hardware for adjustability. Use an M3 nut and M3x8 or M3x12 depending on the length you need. Add some threadlocker to the screw.
Original design by @Kabuto-Filearms
My changes are built on the SCS compatible housing by @Fl-Eggs:8
LBRY Tags: guncad; kabuto; frt; scs; t.u.r.d
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