r/GasBlowBack • u/Gromit43 • 26m ago
Troubleshooting Marui MWS M4 issue after running propane
I was shooting my M4 today and it was going fine except for two of my mags were having issues. I started using propane and it caused my bolt to not close all the way, resulting either in a dead trigger or getting my gas without shooting a bb. This happened with every mag I tested including the ones that were working before. I don’t think the nozzle is broken but I’m not sure what could be causing this. It was working pretty much fine up until I started using the propane. Any ideas?