Army, Geissele, Carpenter Partner on Next-Gen Barrels

The U.S. Army inked partnerships with Geissele Automatics and Carpenter Technology to develop next-generation small arms barrels using GNB 200 alloy and a new rifle profile. The partnerships, formalized through Cooperative Research and Development Agreements (CRADAs) signed in 2022, aim to solve barrel wear and durability problems created by higher-pressure ammunition in modern weapon systems.

Geissele handled the manufacturing side. The company cold-hammer forged the barrels, directed coating alternatives and specifications, conducted performance testing, and developed manufacturability parameters. Carpenter Technology developed the GNB 200 alloy formulation and provided material samples for testing.

GNB 200 Alloy and the F41A21/18 Profile

GNB 200 is described as a "premium remelted alloy steel specially formulated for high temperature wear resistance" that offers higher tensile strength and improved wear resistance compared to legacy barrel materials. The alloy operates near the upper limit of what can be reliably cold-hammer forged, which is where Geissele's expertise comes in.

The F41A21/18 rifle profile, developed collaboratively with Geissele, reduces wear and improves dispersion. The profile received a patent in October 2025.

Why This Matters

Next-generation weapons operate at significantly higher pressures than legacy platforms, which accelerates barrel wear, corrosion, and pressure buildup. The Army also needed to eliminate hazardous hexavalent chromium coatings traditionally used in military barrels. The GNB 200 alloy and new profile address both problems.

Third-year testing was completed on M240L machine guns in spring 2025. The Carpenter CRADA has since expired, while Geissele's CRADA was renewed for three additional years to continue coating development. Geissele acquired the 240LW and 240LWS designs from Barrett Firearms in 2020 and has been working on long-life forged barrels and NanoWeapon coating for machine gun applications.

CRADAs and Industry Readiness

Daniel Cler, the design’s principal investigator, stated that "CRADAs are a good way to influence industry so that as systems are developed to meet Army requirements, industry is ready" with aligned solutions.

That's the practical value here. When the Army eventually fields next-gen systems with higher-pressure loads, Geissele and other manufacturers using GNB 200 alloy will already have production-ready barrels that meet military specs. The civilian market typically follows military adoption for high-performance components, so expect to see GNB 200 alloy barrels in commercial rifles once the Army fully adopts the technology.

Geissele already manufactures cold-hammer forged chrome-lined barrels for its commercial Super Duty line and government contract rifles for Customs and Border Protection. The company's involvement in next-gen barrel development signals that future Geissele rifles may incorporate the GNB 200 alloy and F41A21/18 profile once military testing concludes.