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z APS Airsoft M4 Metal Body + Complete Gearbox Challenge DIY Kit Set
by sary s. Date Added: December 15, 2010
the metal body is really nice has a working bolt catch and gear box has blowback feature. its mechanical the piston catch the bolt and pull it back. the gearbox feels solid but has really cheap parts the only good thing is the full cylinder has a really good air seal. the only problem is that some of the internal are proprietary but still good design and easy to work on.

Rating: 5 of 5 Stars! [5 of 5 Stars!]
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