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FMK Firearms AR1 eXtreme .223 Remington Black AR-15 Lower Receiver

The FMK Firearms AR1 eXtreme stripped AR-15 lower receiver is manufactured in the USA from a high impact proprietary composite polymer, delivering extremely lightweight durability at 4.3 oz. Built as a mil-spec AR-15 foundation, it accepts standard MIL-SPEC uppers and is engineered for long-lasting reliability with compatible lower parts kits.

Key features

  • Stripped AR-15 lower receiver built on a mil-spec compatible platform
  • Proprietary composite polymer construction for superior strength and durability
  • Extremely lightweight design at 4.3 oz
  • Accepts standard MIL-SPEC uppers up to .50 Beowulf when paired with the correct upper configuration
  • Compatible with most current AR-15 lower parts kits, grips, and stocks

Build your next AR-15 project with the FMK AR1 eXtreme polymer foundation and pair it with your preferred upper and components.

FMK Firearms AR1 eXtreme .223 Remington Black AR-15 Lower: quick facts

What caliber is the FMK Firearms AR1 eXtreme .223 Remington Black AR-15 Lower?
It is chambered in .223 Remington, 5.56 NATO, .50 Beowulf.
How big and heavy is it?
Weight 4.3 ounces.
What kind of action does it use?
Single Action.
What sights and finish does it have?
finish: Blue/Black.
Is it new or used?
New, in the original packaging.
Can I buy it in Utah?
Yes. It ships to a licensed FFL dealer in Utah; you pick it up there after the background check. Rifles and shotguns ship to your chosen Utah FFL dealer for the background check and pickup, with no state waiting period.
Is it in stock?
Yes, at $67.84. Orders leave within 1-2 business days; shipping is free over $999.

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