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I have a Systema v2 gearbox lying around that I haven't used since I switched to Polarstar. The gearbox is complete and needs just a tad bit of TLC to make it the way you want. I modded the selector plate for single-fire only and used it in tandem with a Systema Magnum for a DMR setup. This is what it has:
Systema reinforced gearbox with 7mm bearings (LiPo ready, have been using a 7.4v LiPo)
Systema Flat Hexical gear set w/E1 steel bevel gear
Polycarbonate piston with Systema silent piston head and silent cylinder head
M110 Spring (350-380 fps) with ball bearing spring guide rod
Systema Type 0 Teflon Bore Up Cylinder
New CA wiring harness, wired to the front for deans
I'll also include two motors:
Systema HiTorque (for you high-speed fans)
Systema Magnum (for your big springs)
I'm looking to get $120. A brand new one of these will run you $240-250, not including the motors. Let me know if anyone is interested.