FAB Defense FXRBS Rear Back-Up Sight for AR-15/ M16/ M4 Dual Aperture Low Folded Profile Spring-Locked Deployment Black Polymer & Metal CAT-91 Muzzle Energy: 3316 ft lbs

Muzzle Energy: 3316 ft lbs

Muzzle Energy: 502 ft lbs

Caliber: 370 Sako Mag

We take pride in using only the highest quality ingredients and manufacturing our product right here in the USA

FAB Defense FXRBS Rear Back-Up Sight for AR-15/ M16/ M4 Dual Aperture Low Folded Profile Spring-Locked Deployment Black Polymer & Metal CAT-91 Muzzle Energy: 3316 ft lbsType: Folding Rear Frame Material: Polymer Metal Frame Color: Black Firearm Fit: AR 15 Base Configuration: N A Style: Folding Rear Sight Front Material: N A Rear Material: N A Front Color: N A Rail Size: N A Windage Adjustment: Yes Elevation Adjustment: N A Fiber Diameter: N A Firearm Type: AR Platform