Hop-Up chamber for M4 type.
Retro ARMS chambers has parts made at CNC machining center out of EN AW 2007 and EN AW 7075 aluminum.Regulation wheel is from polypropylen . Impression regulation is very effective, because lever does not bend thanks to the used material. Its design allows precise Adjustment in 2mm range with step of 0.01mm.
Chamber is 100% compatible with the Retro ARMS gearbox, but it also fits into standard zinc gearboxes. However be aware that we can't guarantee absolute and precise fitment.
Hop-Up chamber is equiped with o-ring against BBs falling out.
Hop-Up nub is integrated into press lever. This way it won't fall out during assebly/diassembly. Optional press levers can be bought for experimental settings.
C clip isn't included. You can use former one, or order Retro ARMS's indestructible C clip.
Chamber's surface is anodized in black and red color.