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This AR-15 5.56mm 16" Mid-Length Upper Receiver from Aero Precision replicates the standard military M4 upper with one important addition. It has a longer, mid-length gas system that helps slow gas velocity for improved reliability in cycling (over the standard carbine gas system). You get same form-factor as an M4 with reduced risk of M4-type reliability problems. from Brownells (Product 100-025-502WB)

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