- Gibbz Arms G9 Upper Receiver for 9mm- Can also be used for other pistol calibers like 40 S&W, 10mm and 45 ACP! - GIBBZ Arms Patented Left Side Charging Handle Pat. No. 9,310,146- Non-reciprocating with detent to keep the charging handle forward during operation - Can be used with 9mm lowers that use ether Glock mags or Colt Pattern mags.- Shortend 9mm Beveled Ejection Port- Full 15 Slot Picatinny Rail- Rear Bolt carrier door to allow for easy bolt carrier removal and still keeping gasses in during operation (important for suppressed fire)- Charging handle cover for keeping operating gasses in (also important for suppressed fire)- Manufactured in the USA (Arizona) by GIBBZ Arms.- Weight: 13.0 oz.- Dimensions: 8.9 x 2.9 x 2.9 in* Upper not compatible with hand guards featuring anti-rotation tabs without modification. *