U526 & E526 Mil-Spec Compatibility | What Parts Are USGI Standard-Compatible?

Video by Shadow Systems Uploaded January 21, 2026 Length 1:18

U526 & E526 Mil-Spec Compatibility | What Parts Are USGI Standard-Compatible? A video by Shadow Systems. Related product: Shadow Systems SS-6052 U526 5.56 x 45mm 16" Flat Dark Earth Rifle. Watch on YouTube

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