Thril’s new 6 ARC and .338 ARC magazines use caliber-specific geometry and stainless steel bodies to improve feeding in AR platforms.
This is a solution to a problem that many people have been unaware of. Soon, we’ll have high-quality and reasonably priced magazines that actually function in the 338 ARC and 6 ARC platforms.
Built Specifically for ARC Cartridges
At the Thril booth, the focus stayed on one thing: fixing feeding issues with ARC cartridges. Thril introduced dedicated magazines for both 6 ARC and 338 ARC instead of relying on modified 5.56 designs. That choice allows these magazines to function as intended.
The internal geometry matches the ARC case shape. The back rib sits flattened, which lets cartridges stack more naturally. That change reduces binding and nose dive during feeding. The result is smoother cycling, especially under faster strings.
Thril is currently one of only two companies offering true, dedicated 6 ARC magazines (that I’m aware of). If you are one of those shooters who have fought reliability issues because your 6 ARC or 338 ARC won’t feed, this solution is for you.
Capacity, Construction, and Design
Thril offers the ARC magazines in 20-round and 27-round capacities. Both versions use stainless steel construction. The bodies are stamped, then butt-welded rather than overlapped. That weld choice keeps the internal dimensions as long as possible for those high BC, heavy for caliber, bullets.
The magazines also include rear-viewing windows. Shooters can quickly check their round count without removing the mag. The windows don’t interfere with structural strength.
Stainless steel adds durability. It also helps maintain the feed lip shape over time. These mags aim at shooters who run ARC hard, not just for bench shooting.
Why Geometry Matters Here
ARC cartridges don’t behave like 5.56. The case taper and overall length change how rounds stack under spring pressure. Thril adjusted the internal geometry to match that reality.
Better stacking equals more consistent feeding. That matters even more with .338 ARC, which pushes heavier bullets. Thril designed both magazines independently instead of sharing a single internal profile.
Pricing and Availability
Pricing lands in the mid-to-high $40 range. That puts these mags above standard AR magazines. It also reflects the stainless steel build and low-volume production. However, the increase in reliability for your rifle system is probably worth the cost. Especially if you use this rifle to protect your own or others’ lives.
Thril plans to release both the 6 ARC and .338 ARC magazines in Q3, pending final quality control. For those of you who are like me and don’t know what that means, that is between July and September. Once QC wraps up, they’ll hit retail.
Where These Fit
These magazines target ARC shooters who want consistency. They don’t chase gimmicks. Thril focused on feeding geometry, durability, and proper cartridge support.
For shooters running 6 ARC, or who are stepping into 338 ARC, dedicated magazines could make or break the reliability of that system. That alone makes Thril’s magazines worth a look.
Learn more about the 6 ARC and 338 ARC magazines from Thril here.
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