GHK makes the best AK GBB out there, period.
74U is a nice piece, and shoots under 380 FPS OOTB, GIMS has a longer inner, so I'd suspect it shoots more then 380.
Comes down to what you want, if you're doing CQB, I would go 74U or 105.
Siege Airsoft is 380 FPS, TTAC is 350 FPS, you'll need to get a 1J nozzle regardless if you plan on playing at TTAC.
Vector mags are hella expensive, so I would pass on it completely, but that's up to you. $80 USED to 100+tax brand new each.
WE PDW'S don't really exist much, people just go straight M4 CQBR. Most WE PDW you find used on the classifieds are well used or painted.
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