APF Stripped Side-Folding AR-15 Lower Receiver – .223/5.56 NATO


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This item is regulated, therefore your entire order will be shipped to an FFL dealer of your choosing. After you place your order, we will contact you to finalize these details.

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AT3 Rifle Lower Build Kit - Magpul Stock and Grip, AT3 Lower Parts Kit and Buffer Assembly


The Perfect Start to Build Your Next Side-Folding AR

The APF Stripped Side-Folding AR-15 Lower Receiver is an innovative and reliable upgrade for AR-15 builders providing the most ideal set-up to start a custom workshop build. It’s the best option for AR builders to start a side-folding AR from the ground up without the need to buy a separate folding stock adapter.

This AR-15 lower ships assembled with its own premium carbine buffer and features a sophisticated side-folding mechanism that securely locks into place during operation and then conveniently folds to the left when not in use or for storage and transport.

Convenient & Reliable

The APF AR-15 Integrated Folding Lower Receiver is machined from 6061 T-6 aluminum providing overall reduced weight and increased strength. It is coated with a Type III hard-coat anodized finish for extreme wear and corrosion resistance.

It is built for the AR-15 platform chambered in 5.56x45mm, .223 Rem or .300 Blackout, and is compatible with all mil-spec components.


  • Multi-caliber
  • Billet 7075-T6 aluminum
  • Type III hard-coat anodized finish
  • Side-folding design
  • Compatible with all mil-spec AR-15 components
  • Includes carbine buffer


  • Caliber: 5.56x45mm,.223 Rem,.300 Blackout
  • Finish / Color: Black
  • Firearm Type: Pistol, Rifle
  • Material: Aluminum
  • Models Fit: AR-15
  • Type: Semi-Auto


Receiver Material6061-T6 Aluminum
Firearm TypeLower Receiver
Weight12.8 ounces

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Congratulations on your purchase of a firearm or firearm part (“firearm”) manufactured by APF. The firearm is warranted to the original retail customer for one year from the date of original purchase from APF against defects in material and workmanship. All parts and labor or replacement at APF’s option are covered. This warranty applies only to purchases made directly from APF or an APF-authorized dealer.

The sole and exclusive remedy pursuant to this warranty is the repair or replacement (including the cost of shipping the repaired or replacement firearm to you), at APF’s discretion, of the firearm. ANY AND ALL IMPLIED WARRANTIES, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY DISCLAIMED. APF assumes no liability for incidental or consequential damages or injury to person(s) or property of any kind, including but not limited to, any expense or damages other than to repair the defects in the firearm or, at APF’s discretion, to replace the firearm. Repairs will be covered by this warranty for the duration of the original warranty; replacement firearms will be covered by this warranty for (1) year.

Any action against APF based on any alleged breach of this warranty must be commenced within one (1) year of the alleged breach and must be venued in the state courts for Douglas County, Minnesota. By purchasing a firearm from Alex Pro Firearm, you consent to the jurisdiction of said courts and agree that venue there is proper. Minnesota law shall apply to your purchase of a firearm from Alex Pro Firearm without regard to conflicts of law principles.

To the extent any provision of this warranty is prohibited by federal, state, or local law, which cannot be preempted, it shall not be applicable.

To obtain warranty service, you must deliver your firearm with proof of retail purchase, within one (1) year and ten (10) days of your purchase, freight prepaid to:

8290 STATE HWY 29 N

NOTICE: It is your responsibility to ship to APF any firearm in compliance with any and all federal, state and local laws. It is illegal to ship a firearm with ammunition in the firearm or in the same packaging.  Firearms and ammunition must be shipped separately.

The warranty will be void if any of the following occur:

  1. Instructions from APF, if any, are not followed;
  2. Your APF firearm is altered or modified from its original state;
  3. Careless handling, misuse, accidents, abuse or improper care or maintenance;
  4. Use of the firearm in violation of any federal, state or local law, rule or regulation;
  5. Use of ammunition that is reloaded, remanufactured, steel cased, lacquer coated, non-SAAMI, or the wrong caliber;
  6. Barrel obstruction;
  7. Normal wear and tear.