FMK Firearms AR1 Extreme AR-15 Stripped Lower Receiver – .223/5.56 – Black Polymer

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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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Extremely Durable & Lightweight Stripped Lower Receiver Made From Polymer

The FMK Firearms AR1 Extreme AR-15 Stripped Lower Receiver is constructed from a state-of-the-art impact-resistant Polymer that is proven to have superior strength and unmatched durability. This polymer lower receiver is extremely lightweight and is 50% lighter than an aluminum lower, which makes it ideal for lightweight AR-15 builds.

The AR1 Extreme is chambered in 223 Remington and is by far the strongest composite polymer lower on the market today.

Multi-Caliber & Specifically Designed For Firearms

The FMK Firearms AR1 Extreme AR-15 Stripped Lower Receiver uses polymer blended specifically for the construction of firearms.  This lower can be used with any mil-spec upper chambered in everything from .22lr all the way up to the powerful .50 Beowulf.

FMK Firearms doesn’t cut corners and producing a quality product at a price you love.

Features:

  • Superior strength – Built with proprietary composite polymer to withstand extreme conditions.
  • Unmatched durability – When most lowers dent or break, the AR1 Extreme bounces back to shape.
  • Extremely lightweight – 4.3oz • Accepts all standard MIL-SPEC uppers up to .50 Beowulf
  • Compatible with most current AR15 lower parts kits, grips, and stocks.  However, it isn’t designed for 9mm carbine builds.
  • Unconditional lifetime warranty through FMK Firearms.
  • Custom engraving – “The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.”

Specifications:

  • Frame: High Impact Proprietary Composite Polymer
  • Caliber: Multi-Caliber
  • Size: MIL-SPEC
  • Weight: 4.3oz
  • Color: Matte Black
  • 100% USA Made

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.

FMK Firearms Warranty

FMK Firearms warrants to you, the original purchaser of a new firearm, a lifetime warranty from the date of purchase in the United States, your FMK firearm will be free from defects in material and workmanship.

If you make a claim within the warranty period following the instructions given in this warranty, we will, at our option, repair the defect(s), or replace the firearm at no cost to you. If we send you a new firearm, we will keep the defective one.

First, when you purchase your firearm, you must complete in full either the online registration form or mail the warranty registration card to us within 30 days of date of purchase. Then, if you discover a defect, you must notify us or an authorized FMK warranty repair center immediately. You may either call, email or write to FMK at:

Contact Details:

  • Address: FMK Firearms, Inc. Consumer Service Department, 1025 A Ortega Way, Placentia, CA 92870
  • Telephone: 714-630-0658
  • Email Address: support@fmkfirearms.com

PLEASE DO NOT RETURN FIREARMS TO THE ABOVE ADDRESS. If we decide that it is necessary for you to return the firearm to the factory or an authorized warranty repair center, we will issue you an RMA number and the sender must prepay freight. We will not accept C.O.D. shipments or packages without RMA numbers visible from the outside of the package.

We will not cover damage to your firearm caused by:

  • Failure to provide proper care and maintenance
  • Accidents, abuse, or misuse
  • Barrel obstruction
  • Hand loaded, reloaded, or improper ammunition
  • Unauthorized adjustments, repairs, or modifications
  • Normal wear and tear

FMK Firearms excludes and will not pay incidental or consequential damages under this warranty. By this, we mean any loss, expense, or damages other than to repair the defects in the firearm or replace the firearm. No implied warranties extend beyond the term of this written warranty. PLEASE NOTE: Some jurisdictions do not allow the exclusion of incidental or consequential damages, or limitations on how long an implied warranty lasts, so the above exclusion and limitations may not apply to you. This warranty gives you specific legal rights and you may also have other rights.

NOTICE: It is illegal to ship a firearm with ammunition in the firearm or in the same packaging. Firearms and ammunition must be shipped separately.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 5 reviews
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P
Paul
Great for pistol builds

Well made, even color and so light. It's thicker where it needs to be and was easy to build. Trigger pocket was little tight. Anderson trigger won't fit...swapped in PSA trigger and blade fit thru. Very happy.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

M
Mitchell Winter

FMK Firearms AR1 Extreme AR-15 Stripped Lower Receiver - .223/5.56 - Black Polymer

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

c
caleb
question

I haven't got mines yet just quick question is this made out of plastic, or aluminum?

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

T
Trump2024
Do it

This lower works great. Cheep. With all the rest of the fees we have to pay it evens out on the wallet. No problems whatsoever and it’s all spec.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

J
Joseph Sanzano
FMK lower

I have to admit I was surprised item was made of polymer. But I have a ar15 that has upper and lower polymer so it's okay. I will mate it with a aluminum upper so I'm sure it will be okay. Milspec is milspec.
Item appears to be plenty strong. I have not built a rifle with it yet but will soon. I'm satisfied.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.