JT ER2 Upgrades

thingiverse

ER2 mods: Spyder threaded barrel adapter (not currently 100% compatible with all barrels), Buffer tube and mounts for AR style milspec butt stocks, new larger pump handle with integrated Weaver rail, and a clamping feed neck. I also made two inserts that go into the breach to fill voids in the plastic housing halves so balls will roll more smoothly into the chamber. My ending measurements were a bit off, though, and I had to do some sanding. That file isn't posted yet. Clamping feed neck is made from Taulman Alloy 910 - strong and flexible, it works perfectly for this part (highly recommended). You'll need an M4 bolt with a length of 25mm and the corresponding nut. Use an 8mm socket for reference. The bottom uses set screws to mount the feed neck tightly to the feeding tube; you can use any size you like. I just drilled out my holes to the size needed and threaded them with a tap. Alloy 910 is stringy, so be careful - if your printer crosses open paths while printing paintball parts, getting strings removed can be difficult. Check your slicer for an option to avoid crossing open paths before printing in Alloy 910. The feed neck is designed to print without supports when upside down. All other parts were made from Proto Pasta HT CF. The buffer tube mount uses a 10-32 allen bolt that's one inch long (25.4mm). Use a 3/8" socket for the nut.