Magpul
25-round polymer magazine for ICAR and LWRCI Six8 magwells; PSA documents it for the Sabre IC .338 ARC host.
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The PMAG 25 ICAR GEN M3 Window is Magpul's 25-round polymer magazine for the larger SureFire ICAR and LWRCI Six8 magwell pattern. Magpul lists 6mm ARC as the product's native cartridge and specifies a 5.9-ounce weight, 7.6-inch maximum length, anti-tilt follower, stainless steel spring, and dual MagLevel windows.
PSA separately documents this magazine in its Sabre IC .338 ARC host. Buy it for that receiver pattern, not for a standard AR-15 lower. Magpul explicitly says the wider ICAR magazine does not fit STANAG 4179 magwells, and a standard AR-15 magazine is not a substitute in the Sabre IC receiver.
Add the Magpul PMAG 25 ICAR GEN M3 Window to your build and see how it enhances your platform.