My new G&P M7A1 Type B
Externally, keeping it simple, swapped the standard rail for a Dytac Troy TRX Battlerail 7.2" and the flash hider for a SI Cookie Cutter replica, with a G&P T1. Categorically, do not like the stock. That will be changed, looking at probably an MFT BMS or similar.
Internally -
G&G Plastic Hop Unit
A+ REAPS Bucking
Dytac H Nub
Orga Magnus HD 6.13mm 182mm
ASCU Gen 4
Lonex Titan A2 Motor
Will see how that goes for now, I suspect as with all G&P Gearboxes i've had in the past, I'm going to need a new piston after 5-6k bb's, at which point, i'll pop a Lonex Blue one in, along with a Siegetek DSG Gearset, Sorbo, reshim, radius the GB shell etc etc.