Andro Corp 8" 45 ACP Upper Receiver - BLK A2 7" M-LOK, No BCG & CH - $241.56 after Code: BARRELUP With a 8-inch barrel made of Chrome Moly Vanadium and a twist rate of 1-16, the 45 ACP AR Upper from Andro Corp Industries offers dependable performance. It comes fitted with a sleek M-LOK hand guard,