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full metal receiver
A very popular custom stock upgrade for your carbine
Still uses Wolverine Airsoft's Patent Pending Imbalanced Poppet
This has an awesome "flame effect" that shoots out the front of the muzzle when firing
Polarstar Kythera HPA Engine Size:SR-25 Gearbox full metal receiverThe Polarstar Kythera HPA Engine for airsoft AEGs. Fits in various mechbox styles including V2 (M4, etc), V3, and JG SR 25 style. Achieve 270 500 FPS with simple adjustments. In addition to the engine, you will need a base gun, HPA air tank, line, and regulator. The Kythera has been the most eagerly anticipated products from PolarStar in the past decade. This HPA system is a radical departure from all previous systems that PolarStar has produced since
