Looks like a KWA M4 to me (probably wrong) . The guide rails are cut, but why? The only thing that's kinda keeping the piston align is the sector gear. I predict lots of worn pistons for that gun.
Also, if the purpose is to reduce contact for the piston, it would be better to remove the guide rails from the piston instead.
Last edited by HKGhost; April 19th, 2011 at 21:12..
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