Nerf Demolisher Rocket to 1/2in PVC Barrel

Edit 2: V3 of both uploaded. The section meant to fit over a 5/8"/16mm barrel has been upsized slightly to 16.2mm to account for printing tolerances and some different barrel materials, and added a chamfer to keep the printed edge clean. Old versions and step files for everything are still here.

Edit: V2's have been uploaded for both versions. Both feature a slightly smaller(21.2mm vs 21.35mm) OD coupler end for a slightly looser fit in a coupler, and a 15mm section of 16mm ID in case you wa