San Tan Tactical STT-15 6 ARC Rifle
San Tan Tactical · Rifle · In Production · 2022
Also known as: STT-15 6ARC, 6 ARC 18" Rifle
Overview
The San Tan Tactical STT-15 6 ARC is a premium precision AR-15 semi-automatic rifle chambered in 6mm ARC, built on the company's fully ambidextrous pillar billet receiver set machined from 7075-T6 certified aerospace aluminum. It is fitted with an 18-inch Proof Research carbon-fiber barrel with a 1:7.5 twist, run on a rifle-plus gas system for a smooth, tunable impulse with the long-range 6mm ARC cartridge. The rifle uses San Tan Tactical's in-house Wedgelock 16-inch M-LOK handguard, a CMC Triggers 3.5-pound single-stage match-grade trigger, an STT enhanced 6mm ARC bolt carrier group with black nitride finish, and Magpul CTR stock with MOE grip. Fully ambidextrous magazine and bolt releases come standard. Combining the flat-shooting, heavier-for-caliber 6mm ARC round with a lightweight carbon barrel and billet receiver set, this rifle is aimed at long-range target shooting and hunting where reach and precision matter. It is offered in black anodize, green anodize, and black multicam Cerakote finishes.
Specifications
| Weight (empty) | 3000 g (105.8 oz) |
| Overall Length | 940 mm (37.01") |
| Barrel Length | 457 mm (17.99") |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Stage |
| Trigger Pull | 16 N (3.6 lbf) |
| Magazine Capacity | 25 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 808 m/s (2651 fps) |
| Muzzle Energy | 2220 J (1637 ft·lbf) |
| Effective Range | 700 m (766 yd) |
| Maximum Range | 1200 m (1312 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 191 mm (7.52") |
| Number of Grooves | 6 |
| Frame Material | Aluminum Alloy |
| Barrel Material | Carbon Fiber |
| Stock Material | Polymer |
| Finish | Hard Anodized |
Calibers
- 6mm ARC · primary — also known as 6mm Advanced Rifle Cartridge, 6 ARC
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety Selector
- Features: Free Floating Handguard, M Lok Attachment, Rotating Bolt, Flat Top Receiver, Picatinny Rail, Ambidextrous Controls, Billet Receiver, Threaded Barrel, Adjustable Stock, Rifle Length Gas System, Match Grade Barrel, Fluted Barrel
Variants
- San Tan Tactical 6 ARC 18" Green Anodized — Finish
- San Tan Tactical 6 ARC 18" Black Multicam Cerakote — Finish
Production
Production years: 2022-present
Origin
Country of origin: United States
Notes
Premium 6mm ARC build, ~$2,720-$2,724. 18" Proof Research carbon-fiber barrel, 1:7.5 twist. STT Wedgelock 16" M-LOK rail, CMC 3.5lb match trigger, Magpul CTR stock + MOE grip. Lifetime warranty. Magazine capacity is 6mm ARC AR magazine dependent (commonly 25 rounds).
Background
The 6mm ARC (Advanced Rifle Cartridge) was developed by Hornady in 2020 from a 6.5 Grendel parent case for a U.S. Department of Defense requirement, offering long-range performance from the compact AR-15 platform; San Tan Tactical pairs it with a Proof Research carbon barrel for a flagship precision build.