FMK Firearms AR1 Extreme Black Multi Caliber AR-15 Polymer Lower
45 $
FMK Firearms AR1 Extreme AR-15 Poly Lower Features:
The FMK Firearms AR1 lower receiver is a multi-caliber, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer provides superior strength, unmatched durability and is extremely lightweight at only 4.3oz compared to competing polymer lowers. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any AR build is the foundation and on an AR15, that is the lower receiver. This lower is compatible with most current AR15 lower parts kits, grips and stocks, and accepts mil-spec upper receivers up to .50 Beowulf.
FMK AR1 Lower Specifications:
- Brand: FMK Firearms
- Category: Stripped Lowers
- Caliber: Multi-Caliber
- Model: AR1 Extreme
- Series: Lower Receiver
- Type: Lower Receiver
- Finish: Black
- Material: Polymer
- Gun Model: AR-15
- Gun Type: AR Platform
- Trigger: None
- LPK: None
Shipping Restrictions
We ship firearms, ammunition, and related accessories only where permitted by applicable federal, state, and local laws. Customers are responsible for ensuring that the products they order are legal to own and receive in their jurisdiction.
Orders that cannot legally be shipped to the destination address will be canceled and refunded, subject to any applicable processing fees.
Firearm Shipments
- All firearms must be shipped to a licensed firearms dealer (FFL or equivalent licensed dealer where required by law).
- Customers must provide the receiving dealer's information before the order can be processed.
- Firearms cannot be shipped directly to residential addresses where prohibited by law.
- The receiving dealer may charge a transfer fee, which is the customer's
Ammunition Shipments
- Ammunition is shipped only to locations where it is legally permitted.
- Adult signature may be required upon delivery where required by law or carrier policy.
- Ammunition cannot be shipped to P.O. Boxes or other restricted delivery locations.
Order Processing
- Orders are typically processed within 1–3 business days after payment has been received and all required compliance checks have been completed.
- Orders placed on weekends or holidays will be processed on the next business day.
- Processing times may be extended during periods of high order volume or due to regulatory verification requirements.
Shipping Methods
We work with reputable carriers authorized to transport regulated products. Shipping options and estimated delivery times are displayed during checkout and may vary depending on destination and product type.

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