I just had a mag that was filled with propane suddenly pop and gush gas out of the top of the mag, and subsequently each attempt at filling it did the same, so i followed a mag takedown guide and took the valve out and stripped all the o-rings out, dipped them in silcone oil for 30 minutes, refitted them and now its working nicely again, i almost resigned myself to having to buy another mag before i could use the gun again.....