The ODIN Works OTR-15 billet receiver set is a matched upper and stripped lower receiver pair for building an AR-15, here in black (ODIN Works part no. OTR-15-Receiver-Set). ODIN Works machines both halves in house from billet 7075 aluminum, and the lower is cut to match the company’s billet upper so the set fits together as one chassis. The upper is a slick-side design with no forward assist and a low-profile brass deflector, and it comes with a dust cover. The multi-cal lower adds an ambidextrous bolt release and a beveled magazine well. For a builder who wants a distinctive, tightly matched foundation rather than forged mil-spec receivers, this is where the build starts.

Key Specifications

• Both receivers are machined from billet 7075 aluminum, which allows sharper lines and features that forgings cannot carry.
• The pair is a matched set, with the lower designed to match the ODIN billet upper for a clean, tight fit.
• The lower is marked multi-cal, so it is not tied to a single AR-15 chambering.
• The lower includes an ambidextrous bolt release, letting either hand lock or drop the bolt.
• Takedown pins and their hardware are included, which saves sourcing them separately.
• The magazine well is beveled to guide magazines in during fast reloads.
• The upper is slick-sided with no forward assist, for a cleaner profile and less weight.
• A low-profile brass deflector keeps ejected cases away from a left-handed shooter without a bulky bump.
• A dust cover comes included on the upper receiver.
• The finish is black anodized aluminum.

Frequently Asked Questions

What comes in the OTR-15 receiver set? An OTR-15 billet upper receiver with dust cover and an OTR-15 billet lower receiver with an ambidextrous bolt release and takedown pins (hardware included). Fire control, stock and barrel parts are not part of the set.

Which calibers can I build on it? ODIN Works marks the lower as a multi-cal AR-15 lower, so it suits standard AR-15 builds; the caliber is set by the barrel and bolt you install.

Does the upper have a forward assist? No. The OTR-15 upper is a slick-side design with no forward assist and a low-profile brass deflector.

Buy the ODIN Works OTR-15 Billet AR-15 Receiver Set, Black

Matched billet receivers are the part of a build you see every time you pick the rifle up, and the OTR-15 set gives you that look with features already designed in. Find it with our AR-15 lowers, and order from our Lubbock, Texas gun shop for insured shipping to your FFL.