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The .223 upper is not blowback, it is piston 180 based design, but it uses a thicker, mid length piston that should have a gentler recoil impulse and be more durable then the thinner, carbine length one found on the MCR and WK. The Code of Arms spent the day with the Crusader/Spectre crew pumping 1300 rounds through the upper, so at least one example is quite robust. Only time will tell if its durable, and if the blowback based Crusader 9 upper is durable.