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Anybody who's run a can on a standard AR-15 knows the drill: quiet is great, but the gas hitting your face and eyes gets old fast. Gemtech built the GVAC upper to tackle exactly that. This is a complete 5.56 NATO upper group with a 16.1" barrel, ready to drop onto your favorite lower and start running suppressed without all the blowback headaches.
The heart of it is the patented GVAC gas system. It's a mid-length direct impingement setup with a pinned low-profile gas block that works a bit like a tank's bore evacuator. As the bullet leaves the muzzle, the design creates a vacuum that pulls excess gas forward through the suppressor instead of shoving it back toward you. The nice part is it does this without adjustable knobs or extra moving parts to fuss with, and it's built to reduce backpressure no matter which can you're running, though it pairs especially well with Gemtech's own ETM-mount suppressors like the Abyss.
The barrel is 4150 CMV steel, stress relieved and Armornite treated, with a 1:8 twist and 5R rifling that stabilizes a wide range of bullet weights from lighter varmint loads to heavier match projectiles. Muzzle threads are the standard 1/2×28, and it comes wearing Gemtech's ETM flash hider out of the box. The GVAC barrel profile also shifts weight rearward a touch to help balance out the heft of a mounted suppressor.
Gemtech didn't cut corners on the guts. The receiver is 7075-T6 aluminum with M4 feed ramps and indexing marks, Type III hard coat anodized. The included bolt carrier group runs a Carpenter 158 bolt, chrome-lined 8620 carrier, MP tested, with a properly staked gas key. Up front you get a 15" Midwest Industries Combat free-float M-LOK handguard, seven-sided with a continuous Picatinny top rail and integrated QD sling sockets, so mounting optics, lights, and sling points is straightforward. It's a genuinely well thought out package for anyone building a dedicated suppressor host.
Yes. This is a complete upper group and it ships with an enhanced BCG featuring a Carpenter 158 bolt, chrome-lined 8620 carrier, MP tested, and a properly staked gas key. You just need a lower, a charging handle is not included with this assembly, so plan on adding one when you build.
No. The GVAC system is optimized for suppressed shooting but runs just fine unsuppressed too. Where it really shines is when you mount a can, since the gas block is designed to pull excess gas forward instead of back into your face.
The GVAC gas system is built to reduce backpressure regardless of which suppressor you run, so it's not locked to one brand. That said, the included ETM flash hider is an ETM-mount device, so pairing it with a Gemtech ETM-compatible can like the Abyss gives you the smoothest experience out of the box. Running a different brand may mean swapping the muzzle device for one that matches your suppressor's mount.
The barrel has a 1:8 twist with 5R rifling, which is a versatile middle-ground setup. It'll stabilize everything from lighter 55 grain loads up through heavier 69 to 77 grain match projectiles, making it a solid all-around choice for range work, defense, or precision shooting.
| UPC | 022188894615 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 13833 |
| Action | |
| Barrel Length | 16.1" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 30 |
| Package Height | 4.0 |
| Package Width | 4.0 |
| Product Type | Accessory-Uppers |
| Shipping Weight | 5.25 |
| Color | Black |
| Style | Complete |
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