Optical Sight Rail 5.56 cal. 8.46" long. 100% MADE IN THE USA.
Designed for those who want optimum optic accuracy without the need of combat built-in iron sights, but need the other capabilities as found on the #38 Ex Military Swan® Sleeve. This OSR(Optical Sight Rail) slides over the receiver from the rear of the weapon and extends 8.46". It raises the rail by 1/2" while protecting the rifle dovetail rail. Developed in 1998 and released in 1999.
- Length: 8.46"
- Optical Sight Rail 5.56 cal.
- US Patent No. 5,142,806.