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Hi Joseph, Yes this will work on your Bushmaster. If you want a state of the art complete upper receiver for your modern sporting rifle that has all the competition features you're looking for then you want the Phase 5 P515! From the brilliant master minds at Phase 5 comes the next evolution in what a competition quality upper is meant to be. This sleek, light weight target dropping machine features a 16" chrome lined barrel with a 1:8" twist. The upper receiver is matched to a 15" Lo-Pro Slope Nose Quad Rail with True Fit Technology for a positive fit and changeable modularity. It's M-LOC compatible and has an A.R.M.S. 71L Flip Up Sight Set. This rifle is ready to go with M4 feed ramps, an EN M-16 BCG and an ambidextrous Battle Latch charging handle. Get your game on and boost your scores at the next competition with the Phase 5 P5T15 Complete Upper Receiver. Specifications and Features: Phase 5 P5T15 PH5MLOKUPPER Complete Upper Receiver 5.56 NATO accepts .223 Remington 16" 4150 C

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yes it will fit your Bushmaster just fine Specifications and Features: Phase 5 P5T15 PH5MLOKUPPER Complete Upper Receiver 5.56 NATO accepts .223 Remington 16" 4150 Chrome Lined Barrel Button Rifling with a 1:8 Twist FATman Hex Break Mid Length Gas System M4 Feed Ramps 7075-T6 Aluminum Upper Receiver Ambidextrous Battle Latch Charging Handle Electroless Nickel M16 Bolt Carrier 15" Lo-Pro Slope Nose Quad Rail with True Fit Technology M-LOK Compatible A.R.M.S. 71L Flip Up Sight Set Black Finish

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Yes, this will fit and function on your Bushmaster AR15 LOWER REC ACE SKEL lower without issue Joseph.