Nerf ULTRA 5 - Breech

thingiverse

UPDATE: I have to redesign some tolerances so it will improve the chambering of the darts even better than stock, also clear tolerances to make it easier for the darts to get pushed once 'catched'. Do not use this design yet. 03/21/22. Experimenting with A Ultra5 and a 18KG Kronos Spring and a 18mm Spacer, netting around 150ish FPS. - I broke my breech due to wrong assembly. (the spring is not the cause). Anyway this is an Upgraded extra beefy design, so even if wear should snap your stock breech, don'cha worry, I've got you!. This is a 3 part design which requires glueing, but don't worry again, any force due to priming will not wear on the glued spots. The Front where the Ultra Dart will be loaded into the breech, requires some fine sanding. You should try to archive around 16 mm ID and some level of smoothness, this will give you additional 20 FPS to hit 150+ in total. (I get consistens 160 with accustrike type heads). Your tolerances may vary.