Rise Armament RA1010NIB Low-Mass Bolt Carrier Group 5.56x45mm NATO Nickel Boron Steel for AR-15 Lights Fits eyepiece that is between

Fits eyepiece that is between 36mm and 58mm

The Guard Dog Katana presents a premier self defense and survival option

This simple reticle option is ideal for accurate shooting over various ranges

Comes with a satin D2 blade

Rise Armament RA1010NIB Low-Mass Bolt Carrier Group 5.56x45mm NATO Nickel Boron Steel for AR-15 Lights Fits eyepiece that is betweenPacking exceptional performance in a lightweight but full power package RISE Armament designed the RA 1010 Low Mass Bolt Carrier Group (BCG) to help you shoot more accurately. With a reduced reciprocating mass during the firing cycle, it lessens recoil and helps you stay on target. The complete BCG weighs in at just less than 8. 9 ounces.