CNC Hop Up Chamber AR15 UNIDetails Weight: 40 g Shipping weight: 20 g Retro Arms Retro Arms is a Czech manufacturer that is specializing in spare parts for airsoft replicas. Their main products are made from durable aircraft EN AW 7075 aluminium and machined on precision CNC machines. They are go to company if you are looking for highest quality CNC gearboxes, speed triggers, hop up units and many more inner parts
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