Custom Alamo Precision .338 Lapua Bolt-Action Rifle – Defiance Tenacity Action, Bartlein Spiral-Fluted Barrel, Timney Trigger, AG Composites Stock
This custom .338 Lapua from Alamo Precision Rifles is built on the Defiance Machine Tenacity action and outfitted with competition-proven components. It features a spiral-fluted Bartlein barrel with a self-timing muzzle brake, a Timney trigger, an AG Composites full carbon fiber stock with an adjustable cheekpiece, and a detachable Accurate-Mag pattern bottom metal. Alamo Precision’s APR 338 platform has been the number one rifle in domestic King of 1 Mile competition, underscoring the pedigree behind this build.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Details: There are scuffs and wear on the stock, bolt knob, and bolt body. The barrel and action show strong life remaining.
What’s Included
- Detachable bipod with carbon-fiber legs (installed)
- One-piece Picatinny scope rail (installed)
- Self-timing multi-port muzzle brake (installed)
- 1x 5-round detachable steel Accurate-Mag box magazine
Built by Alamo Precision Rifles on the Defiance Machine Tenacity action, this rifle uses a pre-hardened 416 stainless receiver with an integral recoil lug and a 4340 steel bolt. The action includes a mini-16 extractor, plunger ejector, and a spiral-fluted bolt for reduced mass and smooth cycling. Chambered in .338 Lapua, it is configured for long-range performance with reliable feeding from a detachable Accurate-Mag pattern magazine.
The barrel is a spiral-fluted Bartlein with a light palma contour and a threaded muzzle, paired with a self-timing brake for recoil management and quick alignment. The barrel is clearly marked "ALAMO PRECISION RIFLES • NORTH RICHLAND HILLS, TX" and "338 LAPUA 1-9.3," with the muzzle device face marked "338." The 1:9.3 twist suits a broad range of .338 Lapua projectiles.
Ergonomics and stability come from an AG Composites full carbon fiber stock finished in green/olive, featuring an adjustable cheekpiece, a vertical grip, textured grip panels, and a thick recoil pad. An aluminum counterweight in the forend helps balance the rifle around accessories and a loaded magazine. A short Picatinny accessory rail on the forend provides a mounting point for bipods or other gear, and the length of pull measures 13.5 inches.
Topside, a one-piece Picatinny scope rail is installed for secure optics mounting. The bottom metal supports a detachable box magazine system, and this rifle includes a steel Accurate-Mag 5-round magazine for a 5+1 total capacity. A detachable bipod with carbon-fiber legs is installed to aid field stability.
Markings include the Tenacity model designation with Columbia Falls, MT address and a stylized "DEFIANCE" on the receiver. Alamo Precision’s APR 338 record in King of 1 Mile competition highlights the component choices here, including the Timney trigger and the self-timing muzzle brake design often seen in top long-range builds.