FMK AR1 Extreme Stripped Lower, Polymer

FMK AR1 Extreme Stripped Lower Receiver is the perfect foundation for a lightweight, budget-friendly AR-15 build. Constructed from high-strength, impact-resistant polymer, the AR1 Extreme delivers durability while shedding ounces—ideal for recreational shooters, tactical trainers, or anyone seeking a lightweight setup without compromising reliability.

Engineered to mil-spec dimensions, this polymer lower fits seamlessly with standard AR-15 upper receivers and accepts all mil-spec lower parts kits. Whether you’re building your first rifle or crafting a lightweight range gun, FMK’s AR1 Extreme offers affordability, ease of use, and performance in one streamlined platform.

FMK AR1 Extreme Stripped Lower Receiver – Lightweight Polymer AR-15 Lower

The AR1 Extreme is manufactured in the USA of high impact composite polymer. This polymer allows for superior strength, unmatched durability and is extremely lightweight (4.3 oz). The receiver bears the Thomas Jefferson quote, “The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.” The AR1 Extreme accepts all standard Mil-Spec uppers up to .50 Beowulf and is compatible with most current AR-15 lower parts kits, grips and stocks. It is 100% American made.

⚙️ Key Features of FMK AR1 Extreme Stripped Lower, Polymer:

• Material: Proprietary high-impact polymer blend

• Weight: Ultra-lightweight construction for improved handling

• Compatibility: Mil-spec AR-15 uppers and components

• Design: Reinforced areas for added strength and structural integrity

• Selector Markings: “Safe” and “Fire” positions

• Color: Black finish

• Caliber: Multi-caliber – suitable for 5.56 NATO, .223 Rem, and more

• Proudly made in the USA

✅ Benefits of a Polymer Lower:

• Reduced weight compared to aluminum lowers

• Cost-effective solution for budget-conscious builds

• Corrosion-resistant and ideal for humid environments

• Great for training, plinking, or lightweight hunting setups

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