The PMAG 25 LR/SR GEN M3 Window is a lightweight, highly-reliable 25-round magazine for SR25/M110 pattern rifles chambered in 7.62×51 NATO (.308 Winchester). It pairs Magpul’s proven constant-curve geometry and anti-tilt follower with impact-resistant polymer construction and translucent MagLevel™ windows so you can see remaining rounds at a glance. Made in the USA.