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Old 01-25-2019, 22:25   #5
Combat Diver
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Join Date: May 2010
Location: NC/Baghdad, Iraq
Posts: 474
Looks top heavy and definitely a M4 receiver extension, round nut and stock. Doubt that their is any spring/buffer in there. With the mass of the receiver I'm sure the recoil spring is in there like on a M240/M249. With that little weight/heavy recoil don't expect a long service life out of the gun.

CD
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