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Three brands I would recommend:
(sort by alphabet)
KWA LM4
(+) Gas Efficiency
(+) US GI or P-Mag magazine
(+) Great kick
(+) Realistic finish
(+) No wobble handguard
(+) Steel internal (except trigger which is aluminum)
(+) FPS tuned to 380 @20-28C (Other two GBBR shoots about 450 at this temperature)
(-) Requires Bolt catch mod, or else bolt won't work in long run
(-) Hop-up max is 0.30g and a bit finiky. The actuator spring can wear out if your keep hop on for long periods
(-) Upper receiver rail wobbles
(-) Receiver is 3/16" shorter than actual AR-15
(-) Uncommon, relative rare in Canada compared to other system
KJW M4 Version I
(+) Gas Efficient
(+) Front set is compatible with AEG
(+) Reliable -despite using pot metal parts
(+) Bolt catch is a non-issue
(-) Handguard and stock wobbles quite a bit
(-) Metal Thermold magazine (thicker than GI magazine)
(-) Hopup max to 0.28g
(-) Weak recoil
(-) Glossy finish, unrealistic
WE M4 Open-Chamber
(+) Hardest kicking gun
(+) Lots of after market support
(+) Almost 100% compatiable with AR-15 (the ones are not are mainly due to legalities)
(+) Realistic finish, wicked awesome plastic external
(+) 20 & 30 US GI magazine available (30 rounds uses a shell, can be
fitted to customized AR-15 magazine ie PMAG)
(+) VSR type hopup
(+) Magazine compatible with other WE Open-Chamber system (L85, PDW, SCAR for example. AR-15 derivatives are also compatible)
(-) Not very gas efficient (vents liquid vapour out)
(-) Not the most reliable -compared to others
(-) Difficult to control FPS with tightbore barrel, aftermarket bucking running propane
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