I received these in a trade two days ago. The previous owner bought these mags for his M9A3 pistol. These mags are only compatible with Umarex M92A3 and M92A1 Co2 pistols. Both magazines are fully functional, with no leaks! • Each mag holds 25 BBs • Uses standard 12g Co2 cartridges • Metal alloy construction Brand new, these would run you $40 per magazine. $60 shipped!!! Trades are welcomed! All trades must be local, unless you’re willing to ship first!