Rainier Arms RUC Pro

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 10.5 in

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 12 in

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 11.5 in

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 16 in RA-MK1-16-PU-BLK

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 12.5 in

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 12.5 in

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 11.5 in

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 10.5 in

Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 10.5 in

Rainier Arms RUC DI 5.56 NATO Complete Upper 16in Black Medium

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver 16in Black Medium