AR-45 80% Lower Receiver

California Compliant
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.

Recent reviews

5 out of 5 stars

Get the best lower for your PCC build

If you're considering building your own AR-45 buy the best. Jtactical matched sets are less likely to fail. It costs less to put it together right, than cobbling it all together, just to find it doesn't meet your expectations. Building a PCC you want to use components from the same company to ensure a better match. Those components are Upper/Lower, Barrel and bolt carrier group. I especially like you can get answers for your build from Jtactical.

Paul B.

March 22, 2024

5 out of 5 stars


All the little extras that make a big deal during assembly and maintenance makes these lowers the best for any AR build

Jason S.

March 16, 2024

5 out of 5 stars

Quality construction

I have a few of the AR-45 from Juggernaut and couldn't be happier with them. Fit and finish is superb!

Nicholas K.

March 1, 2024

5 out of 5 stars

Impeccable quality

I have purchased several Juggernaught Tactical products and have found all of them to be of the highest quality. I highly recommend everybody interested to buy their products.

Curtis P.

February 22, 2024

5 out of 5 stars

AR 45

Quality product very happy Thanks


February 22, 2024

5 out of 5 stars

Love it!!’

Great quality and finish!!! Will definitely buy from you again! Thank you

John K.

February 12, 2024

5 out of 5 stars


Great experience!

Phillip W.

February 9, 2024

5 out of 5 stars


My build was perfect. Perfect fit 360 degrees. Not one issue other than the Bolt catch won't work on the Drum Mag because the followup is too low to catch the bolt.

Richard B.

February 9, 2024

5 out of 5 stars

Great products!

Great quality.

Dalton C.

February 8, 2024

5 out of 5 stars

Nothing but the best!!

I usually build the finest hand built custom precision firearms you can buy. Items selling for $5000, $6000, or as much as $8000 a piece. I decided, just for fun, to build a PCC 45 to just throw some lead and have fun. I am proud to say I used the AR-45% Model JT-45 Lower and their upper as well. By far some of the best quality I have seen. The machining was flawless. The tolerances were perfect. No slop, no wiggle. Supreme product. If you're looking for the best on the market, don't pass this one up.

Eric R.

February 5, 2024