Name: TX4 Duty Carbine
SKU: 10750
Availability: OutOfStock

Introducing the TX4 Duty Carbine—an engineering-driven firearm solution precision-built to Lone Star Armory’s exacting standards. Designed on a rugged, matched TX4 forged receiver set, this duty-grade carbine comes optimized for immediate, uncompromised performance right out of the box—no modifications required.

Engineered for operational versatility, the TX4-D Carbine provides a robust, reliable platform tailored for patrol, entry, and mission-critical operations. Each component is meticulously assembled to exceed military-grade specifications, ensuring LSA-level accuracy, with 1 MOA or better precision achievable using match-grade ammunition.

Tested to rigorous standards and crafted for superior reliability, the TX4-D is purpose-built to thrive in any setting, whether for professional law enforcement, military deployment, or personal and home defense applications.

NOTE: A $60 surcharge for pinning and welding 14.5″ barrels applies.

TX4-D Carbines are built-to-order with a projected lead time of 4-6 weeks from order to shipping. Should delays occur, customers will be notified of status and updated as progress is made on fulfillment.

First-Responder and Military Discount Eligibility

For those who qualify for the First-Responder and Military Discount, we invite you to provide a copy of your credentials via email to sales@lonestararmory.us. Your dedication deserves recognition.

To purchase this product, a Federal Firearms License (FFL) is required. At checkout, please enter your FFL dealer as the receiving address (or include it in the notes, if you have other items in your cart that do not require an FFL for shipment. Your selected dealer will assist with completing an ATF Form 4473 and conducting a background check as needed. Please ask your dealer to email their FFL to FFL@lonestararmory.us with your name and order number included. This ensures we link the FFL to your order correctly and avoid any shipping delays. Any non-FFL items in your order will be shipped separately to your preferred address.

Before purchasing this product, please ensure that you are in compliance with all local, state, and federal laws and regulations, including the National Firearms Act (NFA). This product may be subject to NFA regulations, which may require registration and payment of a tax. It is the buyer’s responsibility to understand and adhere to these legal requirements. Consult with a legal expert or your local Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) office for guidance on NFA compliance.

Specifications

Caliber and Barrel Options
5.56 NATO: 10.3″, 11.3″, 12.3″, 13.9″ P/W, 14.5″ P/W, or 16″ Hanson profile, nitrided 4150 Chrome Moly Vanadium Steel barrel.
Note: A surcharge for pinning and welding 13.9″ and 14.5″ barrels applies.

Bolt Carrier Group
LSA TX16 Mil-Spec BCG (Microbest OEM) with Sprinco Extra Power 5-Coil extractor Spring.

Operating System
Nitride-coated Mid-length (13.9″, 14.5″, or 16″) or Carbine-length gas system (10.3″, 11.3″, 12.3″) and a low-profile gas block, tuned with Sprinco buffer spring and appropriate buffers.

Muzzle Device
Forward Controls Design Dead Air-compatible suppressor-ready flash hider (enquire about other available muzzle attachments)

Rail/Handguard
Midwest Industries 7-face MLOK free-float handguard

Fire Control Group
LSA Nickel Teflon AR-15 Trigger and Hammer

Butt Stock
Rifle (non-NFA and NFA) – B5 Bravo stock mounted on a Mil-Spec 6 position receiver extension with a Forward Controls staked castle nut with QD receiver endplate.
Pistol – Magpul BSL brace in pistol format.

Grip
Magpul MOE K2+ Grip

Charging Handle
Radian Raptor ambidextrous charging handle

System Controls
– Mil-Spec ambidextrous safety selector
– Enhanced bolt catch/release
– Billet/enhanced magazine button

THE TX4-D CARBINE IS PROUDLY BACKED AND SUPPORTED BY LSA’S FOREVER WARRANTY.

All Lone Star Armory platforms including the TX4-D Carbine are Berry Amendment-compliant, manufactured, and assembled entirely from American-designed and American-manufactured components in the United States for civilian, law enforcement, and military customers. LSA rifles are test-fired and factory-tuned, resulting in less felt-recoil and an increase in reliability and service life.