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Tacfire PK45ACP-LPK: The Tacfire SS-RK45ACP-LPK rifle build kit contains 45 ACP 8.5" barrel/nitride; birdcage flash hider w/crush washer; 5.5" M-Lok free-float handguard; AR 15 stripped billet upper receiver w/M4 feed ramps, 45 ACP-BCG; AR15/.556 Mil-Spec charging handle aluminum w/steel latch; dust cover; AR15 forward assist; AR15 standard receiver end plate; Mil-Spec/commercial castle nut/steel; buffer tube aluminum; 5.5oz 9mm buffer w/tube spring; AR15 USA made lower parts kit and a AR15 standard A2 style black pistol grip/A2 style. This is everything you need to build an AR45 minus the lower receiver.