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Rock Slide USA RS1FS45-RMR Pistol Upper .45 ACP for Glock 21 Black

Rock Slide RS1FS45-RMR Pistol Upper .45 ACP for Glock 21 Black. Compatible with Glock 21/20 Lowers. Black Cerakote finish. Takes standard Glock 21 internal parts, sights, and barrels. Cut for a Trijicon RMR optic.