RA Tech puts the PRO-WIN GBB Mag through the wringer and tricks out the MP7 GBB

RA Tech are busy at work again making what are already awesome gas blowback products, more awesome by adding heavier bolts and their Negative Pressure Adjustment System (NPAS) to liven up the fire experience. RA Tech tricks out the KSC MP7 SMG with their NPAS and Hard Kick steel kit and also puts the new PRO-WIN GBB magazine through the wringer, and by wringer I mean 7 different flavours of GBB AR-15’s.

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