AR-45 80% Lower Receiver

The AR-45 Lower Receiver in 80% completed form. The AR-45 is precision CNC-machined from solid aerospace billet aluminum. It is not a cheap forging. This is a top-tier AR-45 lower receiver perfect for any high quality AR-45build. Some of the features we include are last round hold open, ambidextrous bolt release, internal magazine lock (CA only), and steel magazine stop. If you are in California, please choose the California Compliant option. This comes with an internal magazine lock and our Hellfighter rear pin assembly. IF YOU CHOOSE THE CALIFORNIA COMPLIANT OPTION, THIS LOWER IS ONLY COMPATIBLE WITH OUR UPPER DUE TO THE INTERNAL MAGAZINE LOCK FUNCTION. FOR ALL OTHER RESIDENTS, THIS LOWER WILL FIT ANY OTHER STANDARD AR-45 UPPERS.

Because of our AR-45 design, we were able to keep all of the mil-spec dimensions from the AR-15. This will allow you to use almost any jig compatible for AR15 to complete the AR-45.

4 Cerakote color selections available, which include Magpul FDE, Sniper Gray, Magpul OD Green, and Burnt Bronze.
The non-Cerakote finish options include Black Anodized.
T6 Heat-Treated 6061 Billet Aluminum
Completed weight: 8 ounces
Integral winter trigger-guard for added strength
Flared magwell to improve mag changes.
Laser engraved JTAC logo
Threaded bolt catch
Upper tensioning screw
Bolt catch assembly screw
No roll pins need for assembly
Ambi Bolt Release/hardware
Lifetime warranty against manufacture defects
Threaded rear takedown pin detent hole
Fire and safe engraved on both sides
Uses Glock magazines
LRBHO only guaranteed to work with our upper. Uppers from other manufacturers may not work.
Designed for blowback operation

If you would like to finish your AR-45 80% Lower at home, we offer a jig-kit here. Because 80% Lowers are not considered firearms by ATF, we can ship them right to your front door with no FFL required... but finished rifles must meet all applicable laws and you must be able to legally own a firearm. Compliance with all laws is YOUR responsibility.

Note: This item is restricted from shipping to New Jersey, New York, Hawaii, Connecticut, Rhode Island, Washington D.C., Maryland, Illinois, California, Washington, and Denver Colorado.

Note: Due to ATF final rule 2021R-05F (more info here), you cannot order an 80% Lower and jig-related products at the same time. If you have both in your cart, you will not be able to complete the checkout process.

Frequently purchased together