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Hi I have a complete Aero SPR Upper. This is a 1/8 twist 18in .223 Wyled chamber. Works with both .223 or 5.56mm. Midlength has sytem. M/P tested fluted Heavy profile. Comes with matching M/P tested bolt group and chargeing handle. MLOK rail covers. Bipod stud. And extra rail sections. Shipped $300 or face to face in the Salem area. PayPal gift or cash if face to face.