Odin Otr-15 Billet 5.56 NATO Rifle

The Odin Works OTR-15 Billet Receiver Set in Rattle Green is a precision-machined lower and upper receiver assembly built for the .223 Remington and 5.56 NATO cartridges. This matching receiver set forms the regulated firearm foundation for AR-pattern rifles, delivering the tight tolerances and dimensional accuracy that operators demand when building or upgrading a rifle platform.

Machined from solid billet aluminum, the OTR-15 receiver set offers the strength and dimensional consistency required for reliable firearm function across both .223 Remington and 5.56 NATO ammunition. The matte finish resists glint and corrosion, making it suitable for duty, training, and field applications. At 1.56 pounds, the receiver set is lightweight without sacrificing structural integrity—a critical consideration for shooters building rifles optimized for tactical mobility or extended operations. The rattle green color provides subdued aesthetics while maintaining visibility in inventory management and equipment accountability.

This receiver set is intended for AR-15 rifle builders, gunsmiths, law enforcement armory upgrades, and private citizens building rifles within applicable federal and state regulations. The matched lower and upper assembly ensures proper indexing and lockup, reducing the fitting work required during assembly. Whether you are assembling a patrol rifle, precision rifle, or training platform, the OTR-15 receiver set provides a solid foundation with Odin Works' manufacturing reputation behind it.

AR-15 receiver sets are the federally regulated core component of an AR-pattern rifle. Purchasing a matched set from a known manufacturer like Odin Works eliminates the uncertainty of sourcing and matching individual components, saving time and ensuring dimensional compatibility from the start of your build.