Straight (not tapered) oval handguard for M4 (AR-15, firearm).
Designed for 3D printing, checked with one rifle (so call it "beta").

There are two STP and STL variants for printing and one basic STP which is not great for printing.
1) "Slopes" variant has (surprisingly) 30 deg slopes on some surfaces to avoid much supports, it's the first choise for printing. Engage "Support - buildplate" with slicer, put support blocker over the top of the model.
0.6mm nozzle and 0.2mm layer or 0.4mm nozzle and 0.16mm layer recommended.

2) "Bridges" variant has a couple of 0.2mm planes which you have to cut off after printing, it fits if your printing setup allows 50mm long bridges (PLA with good cooling, for example).
Again, engage "Support-buildplate".

3) "Clean" variant isn't supposed for printing.

I have no idea if it fits airsoft and can't check.
Feedback is appreciated. Simple mods are possible on request.

LBRY Tags: 3dprinting; guns; m4; ar-15