I first printed everything out of 3D Fuel PLa+ and when I assembled it and I inserted a 3D printed CMMG replica 22 mag, it snapped off the feed ramp at the base of the ramp. OK, so I’ll print the barrel adapter out of Fiberon PA612CF, anneal it for 12 hours, and let it sit out for moisture. Assembled everything today and the bolt wouldn’t fully close at first until I forced it closed. And…the feed ramp split at the base of the ramp again. It looks like the bottom of the metal reinforcement plate is striking the top of the feed ramp, as the Fiberon version now has a dent.
Another odd thing with both, the adapter pin holes for the handguard don’t anlign evenly with the cuts in the RS22 barrel. There is maybe an 1/16” (or less) of the barrel that shows on the feed ramp side of the pin holes. It takes a hammer to get one of the pins through both holes and the barrel cutouts. Additionally, dummy rounds would eject with the PLA+ barrel adapter but not the Fiberon one.
Anyone else experiencing this issue with the Wisp and an RS22 barrel?
I’m not new to building guns from parts or from P80 kits, just 3D printed ones. I wasn’t sure how much to file the bottom of the reinforcement plate. I took the edge off, but now I understand the need to file it some, test fit, and file again if still too tight. I was worried about filing too much and it not stripping the next round…but this makes sense. I miss Reddit, but I do appreciate this site and I greatly appreciate your feedback! If nothing else, this gets more discussion going regarding the Wisp…as there isn’t too much about it online and it seems like a really neat project. I’ve had fun so far, but should’ve stuck with Polymaker. I’m not as much a fan of the 3D Fuel filament.
As for the Rossi barrel, it was hard to pass up a threaded RS22 barrel for $37 shipped as part of their BF discounts.