R15E3 IWS Carbine Mod1 – The latest evolution of our SR15 16” Carbine now features an improved URX 3.1 with a longer overall length to allow for better muzzle stabilization. This alteration allows for reduced weight by removing the commonly unused rail section of the system. It also allows shooters who prefer a thinner rail diameter the ability to still mount accessories on the front end of the weapon while providing a comfortable grip.