Receiver Parts

Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver

Rainier Arms RUC 5.56 NATO DI Complete Upper - 16"

Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 10.5"

Rainier Arms / Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly - 8.5"

Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver

Rainier Arms RUC PRO Mk1 Riflespeed Partial Upper Receiver - 11.5"

Rainier Arms RUC PRO Mk1 5.56 NATO Riflespeed Partial Upper Receiver - 12"

Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 14.5" FDE

Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 12.5"