The video opens on the range with the Smith & Wesson M&P15 AXE in 300 Blackout, which the hosts immediately nickname the “battle axe” because they think it sounds better. They explain that this particular rifle uses the GVAC gas system, which Smith & Wesson claims will run both suppressed and unsuppressed with virtually any 300 BLK ammunition you feed it. The promise is that you can switch between light supersonic and heavy subsonic loads without touching the gas system or buffer setup. To put that claim to the test, they load a magazine with 10 rounds of 125-grain Winchester open-tip supersonic and 10 rounds of 200-grain Magtech-style subsonic. They emphasize that this will be the only unsuppressed string they do, joking that shooting 300 Blackout without a can feels morally wrong. On camera, they fire through the mixed magazine, calling out when they transition from supers to subs. The rifle cycles everything cleanly with no malfunctions, and the hosts are clearly surprised, saying they had hoped it would work but did not fully expect it to match the marketing claims. With the basic function test complete, they move on to the suppressor portion of the evaluation. They outline the cans they will be using: the Precision Armament Tie Track, the Otter Creek Labs Hydrogen Infinity with both vented and solid front caps, and the Spectre CAT Dirty Dave. All of the suppressors are mounted using angled spade Plan B–style mounts supplied by the manufacturer, which the hosts appreciate for making it easy to twist cans on and off between strings.
After confirming that the M&P15 AXE will run a mixed magazine of supersonic and subsonic ammunition unsuppressed, the hosts move straight into suppressed shooting. They start with the Spectre CAT Dirty Dave suppressor, an Inconel flow-through design intended for hard use. They begin with supersonic 300 Blackout, planning to fire about 10 rounds to see how the rifle behaves and, in particular, how much gas they feel at their face. They note that supers are expected to function reliably in most setups, so the real focus is on gas management and shooter comfort. On the firing line, they comment that the report is pleasantly quiet for a 300 Blackout AR and that the recoil impulse feels soft and rolling instead of sharp. They are impressed by how little gas they get back through the ejection port, pointing out that many suppressed 300 Blackout ARs tend to be uncomfortable because of excess gas. Once they are satisfied with the supersonic performance, they switch to subsonic ammunition with the Dirty Dave still installed. The rifle continues to cycle smoothly, and they remark on how surprising it is to see the gun run both types of ammo so seamlessly without any adjustments. They also mention seeing occasional fireballs with certain subsonic loads, attributing it to the ammunition and the flow-through design, but they stress that function remains solid. This early suppressed segment sets the tone for the rest of the video, highlighting both sound performance and the low gas-to-face experience.
With the Dirty Dave can thoroughly exercised, the hosts move on to other suppressors to see how the M&P15 AXE behaves with different designs. They mount the Precision Armament TI Titrex, a lightweight titanium suppressor that still carries a full-auto rating. Running both supersonic and subsonic 300 Blackout, they remark that the Titrex delivers a quiet report and produces visible gas and sparks at the muzzle, which they attribute to the combination of ammunition and internal geometry. They appreciate that the can is light enough for extended use yet rated for hard use on semi-auto platforms. Next, they introduce a Fire Creek suppressor, which stands out for its modular construction and serialized band. The serialized band allows the internal core and baffles to be replaced or upgraded in the future while keeping the original serialized portion intact, making it easier to stay current with evolving suppressor technology without starting a new tax stamp. On the AXE, the Fire Creek can runs both supers and subs without drama, further reinforcing the idea that the GVAC system can handle a wide range of back-pressure profiles and ammunition types without user adjustments. Throughout this segment, the hosts keep circling back to how unusual it is for a 300 Blackout AR to be this forgiving with different cans and loads straight out of the box.
The focus then shifts to the Otter Creek Labs Hydrogen Infinity suppressor, which the hosts describe as a hefty, hard-use can. They start with the vented front cap installed, explaining that this cap is designed to bleed off some gas at the front of the suppressor to reduce back pressure at the action. Mounted on the M&P15 AXE, the Infinity is tested with both supersonic and subsonic 300 Blackout. With the vented cap, they notice that the rifle is slightly louder at the muzzle compared to more traditional high-back-pressure cans, but in exchange they experience significantly less gas coming back toward the shooter. They emphasize how comfortable the rifle is to shoot, even over longer strings, with minimal gas to the face and a soft recoil impulse. After several magazines, they swap to the solid end cap to see how the character of the system changes. With the solid cap installed, the report becomes a bit quieter, but back pressure increases, which would normally be a recipe for discomfort on many AR-15s. On the AXE, however, the hosts still report manageable gas levels and consistent cycling with both supers and subs. They continue alternating ammunition types and cans, underscoring how the GVAC system appears to balance gas flow in a way that keeps the rifle reliable and pleasant to shoot across different suppressor configurations.
After running the M&P15 AXE with multiple suppressors and a mix of supersonic and subsonic ammunition, the hosts circle back to the core marketing claim: that this rifle will handle essentially any 300 Blackout load, with or without a suppressor, and do it without user tuning. Based on their time on the range, they say the rifle has lived up to that promise. They note that it has been consistently soft-shooting, with low gas blowback and no need to adjust gas blocks, buffers, or springs as they changed cans and ammo. They mention that they pushed the gun through extended strings to stress the system and still did not encounter cycling issues. The hosts speculate that the AXE would likely be able to support more aggressive trigger setups without needing to reconfigure the recoil system, which they see as a testament to how robust the gas design is. They contrast this performance with other products marketed as back-pressure solutions, pointing out that many of those systems do not deliver on their promises, especially on finicky 300 Blackout builds that alternate between supers and subs. The discussion highlights how challenging it usually is to get a 300 BLK AR to run everything well, making the AXE’s out-of-the-box behavior stand out in their minds.
In the closing portion of the video, the hosts step back and talk about what the M&P15 AXE and its GVAC gas system might mean for the broader AR-15 market. They predict that within a few years, similar gas technology could become common across many platforms, especially in calibers where shooters frequently switch between subsonic and supersonic loads and often run suppressors. They specifically call out 300 Blackout, 8.6 Blackout, and 375 Raptor as prime candidates for this kind of system. The hosts argue that if manufacturers can offer rifles that handle a wide range of ammunition and suppressor combinations without user adjustments, it could significantly reduce the appeal of traditional adjustable gas blocks and other tuning-heavy solutions. They repeatedly describe the AXE as an awesome rifle and return to the “battle axe” nickname as they sum up their impressions. Their final verdict is that the M&P15 AXE delivers on its promises of reliability, comfort, and versatility, and they encourage viewers who are interested in 300 Blackout ARs to pay close attention to this style of gas system as it continues to develop.
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