r/40_mm

I'm consolidating my inventory of 40mm.

Finally got to take the m203 out to shoot for the first time and I think Boland had a batch of mislabeled .380 stage blanks. I bought supposedly full power loads, but it sounds like it is primer only. Going to disassemble one of them later this evening.

I found this on IG and ended up buying one. The shell retention is pretty innovative, using little ball bearing detents that lock into the case rim. For a printed part it’s very well made, metal thread inserts in all the places that have bolts in them, pretty sturdy, no obvious seams.

The retention seems a lot more consistent across multiple cases (aluminum/nylon/short/long) and different manufacturer compared to traditional kydex friction fit ones like what Hurricane Butterfly makes.

Only gripes so far are it can get a little crowded on the barrel with long casings and a vertical grip but there’s not much to be done about that regardless of design. There’s also a pic rail mounted model.