Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 14.5 in RA-RUC-DI-14M-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a direct impingement operating system on their new...
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 14.5 in RA-RUC-DI-14M-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a direct impingement operating system on their new...
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