4mm Allen 200mm
thingiverse
Airsoft shotgun stock loose? No Allen key in hand or have one but it's too short? Got a 3D printer handy? This fix will probably tighten it enough to be useable for a bit. The overall length is 220mm due to the handle on top. I only printed this once and it came unstuck at the end so I cut off the broken part (about 15-20mm) and filed it down and it still worked better than expected. Layer height likely doesn't matter, I used 0.3mm fast mode in Simplify 3D. 100% infill is a must for strength obviously.
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