Don't compare the WE pistols to the GBBRs - they are in a different league.
I have nine WE M4 propane mags total and none of have yet to leak. Just keep them gased up full (10-15 seconds of propane) with a good amount of silicon oil to keep the o-rings lubed, etc.
Go with the WE M4 GBBR - you won't regret it
