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Will a DPMS 7.62x39 upper receiver fit a Bushmaster XM15-E2S? Will any compensator fit an AR-15?

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A DPMS 7.62 X 39 upper will fit on the Bushmaster lower receiver.
Different caliber AR-15 compensators use different thread sizes. The .223/5.56 compensators are 1/2" X 28 tpi. The 7.62/.308/6.8 SPC compensators are 5/8" X 24 tpi. The 9mm compensators are 1/2" X 36 tpi.
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