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The CMMG Banshee Mk4 upper group takes the AR-15 into big-bore territory without pushing you toward a heavier AR-10 build. Chambered in .338 ARC, Hornady's subsonic-focused cartridge, this 10.5-inch setup delivers roughly 1.5 times the energy of comparable .300 Blackout subsonic loads while running the same tight, compact envelope you'd expect from the Banshee line. If you already own an AR-15 lower, this drops right on and gets you shooting a .338-class projectile.
The .338 ARC was built around subsonic performance first, using a necked-up 6.5 Grendel case and running the same Grendel bolt face for parts compatibility. That means standard ARC magazines and a bolt a lot of builders already have on hand. The 1:8 twist barrel stabilizes a wide range of .338 projectiles, from the heavy 307-grain subsonic Sub-X bullets that shine suppressed to lighter 175-grain supersonic loads that stretch usable range out toward 200 yards. It's a genuinely versatile cartridge that switches between quiet and hard-hitting without a lot of gas system fuss.
This is a complete upper group, so the heavy lifting is done for you. It's built on a Mk4 billet 6061-T6 aluminum receiver and wears CMMG's EML9 handguard, a lightweight aircraft-grade piece with M-LOK slots at the 3, 6, and 9 o'clock positions plus a Picatinny/M-LOK hybrid top rail for optics and accessories. The 4140 chrome-moly barrel carries a nitride finish and threads 5/8×24 at the muzzle, capped with a CMMG ZEROED linear compensator that pushes blast and concussion forward and away from you, which is a real comfort upgrade on a short barrel.
The .338 ARC is well suited to short barrels, so you're not giving up much ballistically by running 10.5 inches. That short length combined with a suppressor makes for a compact, quiet, and genuinely potent package for close to medium range work, whether that's hog hunting, range time, or a purpose-built home setup. Everything is made in the USA and backed by CMMG's Lifetime Quality Guarantee.
Yes, this is a complete upper group, so it ships assembled with the barrel, bolt carrier group, and a CMMG ZEROED ambi charging handle. You supply your own AR-15 lower and you're ready to build. The bolt uses a 6.5 Grendel bolt face, which is worth knowing if you're stocking spare parts.
It does. The Banshee Mk4 upper is built on the AR-15 platform and pins onto a standard mil-spec lower. That's the whole appeal of .338 ARC, you get big-bore terminal performance without moving up to an AR-10.
The .338 ARC runs standard AR-15/ARC-pattern magazines since it's built on a necked-up 6.5 Grendel case. That keeps feeding simple and lets you use gear a lot of builders already have. The 1:8 twist barrel handles both subsonic and supersonic loads well.
It is. The .338 ARC was designed with short barrels in mind, so you're not sacrificing much ballistically at 10.5 inches. Paired with a suppressor, this length makes for a compact, quiet, and hard-hitting setup for close to medium range work.
| UPC | 840442506247 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 34B8D0F-AB |
| Shipping Weight | 4.007 |
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