JG - G36's are good bet
CM = Cyma good AK's but stick the proper types not budget 5xx series
PJ = A&K's rebadged decent stuff
Boyi or D-Boys - hmm got a 8001 or 416 or 614 M4 - needs work/tweak and heavy bastid
dunno about snipers but quite a few have bought these
Be careful of their spare internal parts
a lot is oem and Big Dragon gears are very cheap but $hit bevels - GET SHS instead
seriously SHS or RA gears from ak2m4 are worth the extra five or six quid
I show ya what I mean - the 10 teeth on bevel just snap with a mild jam....
get SHS or Rocket gears - even old 007 loves them...
a lot of their parts are Big Dragon - hit n miss, or other cheapy stuff
some isn't too bad and worth a punt, others are just crap
so be careful on what "upgrade" parts you buy
ooh cheapo pistols - non blowback and others
not as big as GunFire but often they offer good prices on some guns n stuff
would help if you let us know what you are thinking of