This is the first of Fulcrum's Project MAC with the WELL MAC-11... "Recently I decided to give my beloved WELL MAC-11 #airsoft GBB a well deserved overhaul. I haven't had much use of this #airsoftgun as it's a really fussy thing when it comes down to the gas efficiency, in the stinking hot it works fine but even if it gets slightly damp, it won't cycle correctly and the range diminishes. To fix the gas problem I've bought some bits, you'll find out soon what they are.