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| Selective Integrated Rail System M4-A1 Carbine Bi-Level - Fits flat-top equipped weapons with carbine length gas systems. The #45™ is a standard S.I.R. ® featuring a standard top dovetail rail and can be used in conjunction with the #40™ series rear sights and a standard height front sight post. This civilian version requires no modification to the weapon. |
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Features
Standard width, not a slim line model
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