South Texas Armament: Custom Precision Rifles, Wildcat Cartridges & a Growing Track Record

FROM PURPOSE-BUILT HUNTING RIFLES TO PROPRIETARY ACTIONS AND DOCUMENTED ACCURACY, THIS NEW BRAUNFELS BUILDER HAS MORE TO SHOW THAN ITS BUSINESS DESCRIPTION ALONE SUGGESTS.

Written by LRR.com
November 10, 2026 | 7 min read

MORE THAN A THREE-PRONGED RIFLE SHOP

Custom rifle building, ammunition manufacturing, and NFA services. Three distinct areas of the firearms business, operating under one name.

That combination makes South Texas Armament an interesting company. But its growing collection of documented rifle builds makes it considerably more interesting.

Based in New Braunfels, Texas, South Texas Armament identifies itself as a custom rifle builder, ammunition manufacturer, and NFA dealer specializing in long-range hunting and competition rifles. Its business brings together precision-rifle craftsmanship, cartridge expertise, suppressor-related services, and a selection of components intended for serious shooters.

The difference today is that prospective customers no longer have to rely solely on those descriptions.

South Texas Armament now has five rifle profiles in its LongRangeRifles.com showroom, covering everything from a compact 22 Creedmoor hunting rifle to a custom 300 PRC magnum. Several include recorded accuracy figures, detailed component specifications, and supporting shot-group documentation.

Its profile currently displays an average accuracy of 0.271 MOA, with two rifle records containing verified performance results.

For a builder looking to demonstrate what its rifles can actually do, that’s a meaningful start.

INSIDE THE SOUTH TEXAS SHOWROOM

A closer examination of the company’s five listed rifles reveals a builder comfortable working across different cartridges, actions, barrel configurations, and stock designs.

22 Creedmoor Custom — LRR-STX-0006

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The 22 Creedmoor Custom, described as the Copperhead, is an example of South Texas Armament’s approach to a relatively compact precision hunting rifle.

Built around a Defiance Anti-X action, it features a 20-inch Proof Research Sendero barrel, McMillan Game Warden stock, TriggerTech Diamond trigger, and Nightforce NX8 2.5–20 optic.

At a listed 9.5 pounds, the rifle balances portability with the substantial component quality expected from a modern custom build.

Its showroom profile reports 0.25 MOA accuracy, although the registry does not currently show a verified performance record supporting that figure.

The combination suggests a rifle intended for hunters who value a manageable package without abandoning the precision-oriented features commonly associated with heavier builds.

7mm PRCW Custom — LRR-STX-0005

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Perhaps the most technically interesting rifle in the current showroom is the 7mm PRCW Custom.

South Texas Armament describes this as a 7-6.5 PRC wildcat, a cartridge concept that reflects the builder’s willingness to work beyond conventional factory chamberings.

The rifle uses a Defiance Anti-X action, 22-inch Bartlein Heavy Varmint barrel, Manners EH-1 stock, TriggerTech Diamond trigger, and Nightforce NX8 4–32 optic.

Its listed ammunition features a 180-grain Berger Hybrid bullet at a reported muzzle velocity of 2,962 feet per second.

More notable is its recorded accuracy.

The showroom contains a verified 0.08 MOA three-shot group at 100 yards, fired with a custom handload using the 180-grain Berger Hybrid Target bullet.

That’s an exceptionally small group and a compelling example of the rifle’s demonstrated potential.

However, three-shot groups are limited samples. They document performance on a specific occasion, not guaranteed repeatability across different ammunition lots, environmental conditions, or extended firing strings.

Still, this is precisely the kind of supporting documentation serious buyers should want to see.

SOMBRA 6mm PRC — LRR-STX-0003

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The SOMBRA 6mm PRC introduces another important dimension of South Texas Armament’s operation: its own branded receiver platform.

Built around the STX SOMBRA action, this hunting rifle pairs a 24-inch-class configuration with an X-Caliber carbon barrel, TriggerTech Diamond trigger, McWhorter Custom stock, and Leupold Mark 5HD 3.6–18×44 optic.

The listing specifies a 115-grain Berger VLD Hunting bullet at 3,250 feet per second.

With a reported weight of 9.8 pounds, the rifle represents a performance-oriented hunting configuration that combines a modern high-BC projectile with a carbon-barrel platform.

The completed customer build is marked sold in the showroom. No accuracy result has yet been submitted for this particular rifle.

SOMBRA 300 PRC — LRR-STX-0002

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Moving into magnum territory, the SOMBRA 300 PRC demonstrates a different application of the same builder’s philosophy.

This rifle incorporates an STX SOMBRA action, 22-inch Proof Research Sendero barrel, AG Composites K2 stock, TriggerTech Diamond trigger, and Nightforce NX8 4–32×50 optic.

The listed ammunition is a 225-grain Hornady ELD-M at 2,875 feet per second.

At 9.9 pounds, the rifle offers a relatively moderate listed weight for a scoped custom 300 PRC hunting configuration.

The showroom reports 0.50 MOA accuracy, although a verified performance-history entry is not presently shown.

This completed custom build is also marked sold.

Element 6mm PRC — LRR-STX-0001

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The Element 6mm PRC provides another useful point of comparison.

Built on a Mack Brothers Element action, it features a Proof Research Competition Contour barrel, Manners LRH stock, TriggerTech Diamond trigger, and Nightforce NX8 4–32×50 optic.

At 13.1 pounds, it is notably heavier than the other listed rifles, reflecting a different balance between carrying weight and shooting stability.

Its performance record includes a verified five-shot group measuring 0.26 MOA at 100 yards, using custom ammunition loaded with a 115-grain Sierra/Tubb DTAC bullet.

For buyers interested in evaluating consistency, a documented five-shot result adds useful context alongside the builder’s other reported accuracy figures.

Together, these five rifles provide a more concrete picture of South Texas Armament’s capabilities than a description of its specialties ever could.

MORE THAN ASSEMBLY: THE SOMBRA AND SOTEX RECEIVERS

One of the more interesting aspects of South Texas Armament’s business is its lineup of branded precision-rifle receivers.

The company offers both its SOMBRA and SOTEX receiver platforms, each aimed at different applications.

The SOMBRA receiver is described by South Texas Armament as its flagship dedicated hunting action, featuring weight-reducing pockets and a split rail intended to reduce mass while retaining a one-piece receiver design.

The SOTEX receiver, based on the Kelbly’s Prometheus, is offered in short- and long-action configurations with multiple bolt-face options.

That gives customers choices extending beyond chambering and stock selection.

An action is the mechanical foundation of a bolt-action precision rifle. Its design, manufacturing quality, geometry, and compatibility with surrounding components affect how the entire rifle comes together.

For a custom builder, having identifiable receiver platforms also helps establish a consistent product identity rather than relying exclusively on combinations of third-party components.

South Texas Armament still incorporates respected industry names throughout its builds, including Bartlein, Proof Research, TriggerTech, Manners, McMillan, and Nightforce.

But its SOMBRA and SOTEX offerings provide a more distinctive foundation for the company’s rifle-building program.

WILDCAT CARTRIDGES AND THE AMMUNITION CONNECTION

South Texas Armament’s cartridge offerings provide another reason to look beyond its rifle photographs.

The company publishes an extensive chambering list covering established SAAMI cartridges alongside specialized wildcats and proprietary-designated variants.

Its offerings include familiar chamberings such as 22 Creedmoor, 6mm PRC, 6.5 PRC, 7mm PRC, and 300 PRC, along with more specialized options such as 25 SOTEX, 6.5 SOTEX, and 7mm PRCW.

That selection reflects an operation serving customers whose requirements may extend beyond standard factory chamberings.

A builder working with specialized cartridges needs to understand more than the mechanical assembly of a rifle. Chamber dimensions, projectile selection, ammunition compatibility, and the intended application all become important parts of the finished system.

South Texas Armament’s combination of rifle building and ammunition-manufacturing capability potentially allows closer coordination between those disciplines.

Its documented 7mm PRCW build is a useful example: the LRR performance record identifies a custom handload accompanying an exceptionally small three-shot group.

What the available records do not establish is whether the company performs a standardized rifle-and-ammunition development process for every customer build.

That distinction matters. The capability to manufacture ammunition is valuable, but the real measure is how consistently a builder applies testing, documentation, and quality control to completed rifles.

For buyers exploring a specialized chambering, those are worthwhile questions to ask.

THE NFA AND SUPPRESSOR COMPONENT

South Texas Armament also identifies itself as an NFA dealer, and its public catalog includes suppressors and related components.

Its rifle listings reinforce that connection.

The SOMBRA 300 PRC, for example, lists an Otter Creek Labs Hydrogen-L suppressor. Other builds feature Otter Creek Labs muzzle devices or suppressor-related equipment.

The ability to coordinate suppressor selection with a custom hunting rifle can be valuable to customers seeking a complete, compatible setup.

Suppressors can reduce muzzle blast and sound exposure, although they do not eliminate the need for appropriate hearing protection or careful attention to firearm configuration.

The company’s NFA activities operate within a separate federal regulatory framework governing the manufacture, dealing, and transfer of regulated firearms and devices. The specific activities a business may perform depend on its licensing and tax classification.

For buyers, the practical advantage is having a rifle builder familiar with both precision-rifle components and suppressor-related considerations.

WHAT THE PERFORMANCE DATA TELLS US — AND WHAT IT DOESN’T

South Texas Armament’s current LRR profile displays five rifle builds and a 0.271 MOA average accuracy figure.

That’s an encouraging set of reported results, but it deserves proper context.

Not every rifle in the showroom has verified accuracy documentation. Two listings currently include verified performance-history records: the 7mm PRCW Custom at 0.08 MOA for three shots and the Element 6mm PRC at 0.26 MOA for five shots, both at 100 yards.

Other rifles have submitted accuracy figures without equivalent verified performance-history entries.

The distinction between reported accuracy and verified test documentation is important.

A single outstanding group demonstrates what a rifle accomplished in a particular test. Repeated groups, consistent ammunition performance, and results collected over time provide a stronger basis for judging repeatability.

The average displayed on a builder profile is a useful starting point, but it shouldn’t replace examination of individual rifle records, test conditions, and supporting evidence.

South Texas Armament’s documented results give prospective customers something tangible to evaluate. Additional standardized accuracy records would make that picture even stronger.

The builder currently holds Verified status on LongRangeRifles.com. No customer reviews are yet displayed on its public profile.

Its technical showroom, however, already contains meaningful information about real builds, component selection, cartridge preferences, and demonstrated performance.

A BUILDER WORTH A CLOSER LOOK

South Texas Armament presents an interesting combination of capabilities.

Its rifle portfolio demonstrates experience with both traditional custom configurations and proprietary-branded receiver platforms. Its cartridge offerings extend into wildcat territory. Its ammunition background brings another dimension to rifle development, while its NFA activities broaden the services available to customers.

Most importantly, its LongRangeRifles.com showroom now makes those capabilities easier to evaluate through actual rifle specifications and documented results.

Five builds do not establish the full reputation of a custom rifle manufacturer. Nor should a handful of impressive groups be mistaken for a comprehensive accuracy history.

But they are a legitimate foundation.

For hunters considering a custom rifle, competition shooters exploring specialized cartridges, or buyers evaluating precision-rifle builders, South Texas Armament has moved beyond a simple business description.

There are real rifles to examine, meaningful specifications to compare, and performance records worth investigating.

Explore the complete South Texas Armament showroom on LongRangeRifles.com to review its five registered builds, examine their specifications, and compare the company’s approach with other verified precision-rifle builders.