3D Printed UMP Stock for A3 Adapter
For those who mentioned they wanted to follow the progress on this Stock build, here is an update. Before someone asks or points it out, no, this isn’t an exact HK/B&T stock. It is strong, it fits the A3 Industries Adapter, it slightly blocks the ejection port so you probably can’t fire with it folded, and the final prototype parts including the butt pad are printing now. This was made as a cheap, easy to print alternative that printed in nylon will cost about 15.00.
- Minus a few small tweaks, the main stock body, is done. Printing in two halves for speed of printing. Alignment pegs are integrated to help join the two sides, as without them, it’s a nightmare( ask me how I know). Printing just those portions saved filament and time, and the rest of the stock needed no further work.
- Latch button is in progress and the second iteration is on the printer.
( update: it locks well and moves freely)
- Butt plate is roughed in, but, I have tweaks I want to make. Not sure if I should keep it the same material as the stock or, print a hybrid with TPU rubber for the ribbed rear section. Options welcome. Not sure it’s needed on a PCC, and it would depart from the classic design.
- All prototypes were printed in PLA because it cheap and fast. Honestly, I probably don’t need a stronger material but, because of the hinge portion, I will be printing the final out of nylon.
More to come! Please, offer suggestions and recommendations! Many hands make light work. As the design stands now, it absolutely could be slapped on and used, but, I’m me and it needs more work. This design bolts directly into the A3 adapter as it stands, I just need to get the stock button finished and spring installed to tweak for lockup.