Fab Defense NFR M4 Carbine Length – aluminum rail for M16, M4 & AR15 carbines – 4 picatinny rails (top, bottom, left & right – for carrying tactical accessories, better strength of the assembly and excellent heat dissipation). 6061 T6 aluminum construction, hardened anodized coating, level marking in the gaps, perfect alignment with the receiver, fixing on the cylindrical nut and via 06 fixing points – the barrel remains floating, designed exclusively for “Carbine Length” carbines.
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