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There are plenty of 6mm ARC builds floating around these days, but very few show up with a parts list like this one. San Tan Tactical starts with their slick-sided STT-15 Lite receiver set, machined from billet 7075-T6 aerospace aluminum and finished in a deep Type III hardcoat anodize. The Lite version skips the signature pillar cuts of the standard STT-15 for cleaner lines and shaved weight, and the receivers are matched and hand-fitted so everything locks up the way a precision rifle should.
The headline feature is the 18 inch Proof Research carbon fiber barrel. You get the stiffness and heat management of a heavier profile without lugging around the weight, which is exactly what you want when 6mm ARC starts stretching your effective range well past what a standard 5.56 gun can offer. The whole rifle comes in around 6.9 pounds, so it carries like a lightweight carbine but shoots like a dedicated precision gun. A rifle-length gas system keeps the recoil impulse smooth, and the suppressor-optimized enhanced bolt carrier group with an HPT/MPI tested 6 ARC bolt means it plays nicely with a can if that is where your build is headed.
San Tan did not cut corners on the touch points either. A CMC 3.5 pound single-stage match trigger breaks clean without the mushy feel of a mil-spec unit, and the Magpul CTR stock and MOE Plus grip give you solid, familiar ergonomics. Magpul MBUS Pro flip-up sights come mounted front and rear, and the 16 inch M-LOK rail leaves plenty of real estate for a bipod, light, or whatever else your setup calls for.
This one makes a lot of sense for hunters chasing deer or hogs at longer distances, PRS-style gas gun matches, or anyone who wants an AR-15 platform rifle that hits harder and flies flatter at distance. Slap a quality optic on top and this rifle is ready to show you what the 6 ARC cartridge can really do.
The Lite uses San Tan's slick-sided billet receiver set without the signature pillar lightening cuts found on their standard models, and it runs standard controls rather than the fully ambidextrous mag and bolt release setup. You still get the same matched billet 7075-T6 construction, Proof Research barrel, and premium parts list. It is a cleaner, simpler take on the same rifle.
It is a strong fit for it. The 6mm ARC cartridge delivers noticeably better downrange energy and a flatter trajectory than 5.56, making it capable on deer and hog sized game at ranges where a standard AR-15 runs out of steam. At roughly 6.9 pounds with a carbon fiber barrel, it also carries well on longer walks into the field.
Yes, San Tan built it with suppressed use in mind. It runs their suppressor-optimized enhanced bolt carrier group along with an HPT/MPI tested 6 ARC bolt with a Crane O-ring upgrade for added extraction reliability. The threaded Proof Research barrel makes mounting a can straightforward.
No optic is included, but it ships with Magpul MBUS Pro flip-up front and rear sights already mounted, so you can shoot it right away. Given the 6mm ARC cartridge's long-range potential, most owners pair it with an LPVO or a mid-power precision scope. The flat top rail and 16 inch M-LOK handguard give you plenty of mounting options.
| UPC | 680599034701 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | STT-15 Lite 6ARC |
| Action | |
| Barrel Length | 18" |
| Caliber/Gauge | 6mm ARC |
| Capacity | 15 |
| Color | Black |
| Model | |
| Product Type | AR |
| Sights | Front/Rear Flip Sights |
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