Stay on top of your round count with the Magpul PMAG 20 LR/SR GEN M3 Window. Designed for .308 Win / 7.62 NATO AR-10 platforms, this magazine combines Magpul’s legendary reliability with a side window and paint-pen dot matrix for instant visual ammo checks.


Crafted from impact- and crush-resistant polymer, the PMAG 20 LR/SR Window is optimized for strength, lightweight handling, and long service life. The anti-tilt, low-friction follower and stainless-steel spring ensure flawless feeding from start to finish, whether at the range, in competition, or in defense scenarios.


Key Features:


20-round capacity (.308 Win / 7.62 NATO)


Side window with round-count indicators


Fits AR-10, SR-25, M110, and other LR/SR platforms


Durable GEN M3 polymer construction


Anti-tilt, low-friction follower for reliable feeding


Stainless-steel spring resists corrosion


Ribbed grip and dot-matrix panel for ID marking


⚠️ Note: Not compatible with Armalite AR-10B rifles or other non-standard .308 platforms.