Not sure on specs or what they changed, but I do know they had modified it well out of normal specs. I think it would be grossly overgassed with normal ammo, probably beating itself up a bit. But the entire gas system on that Beck gun was highly modified so it would cycle the subsonic ammo. These barrels obviously have tight twist rates for the heavier, slower bullets and, from the sounds of it, perhaps a longer throat to clear larger projectiles and maybe a modified gas port (although it doesn’t look vastly oversized in the photos and, if the ammo really cycles a standard AR, it wouldn’t have to be oversized). One thing I did notice is that Allegiance claims their subsonic ammo runs a totally standard AR-15. But there’s no reason these Allegiance ones wouldn’t also work with normal ammo, and the text of their press release makes that pretty clear: “Coming soon the Allegiance subsonic barrel designed for subsonic and supersonic ammunition.” 223 caliber bolt-action rifle firing low-velocity (subsonic) ammunition using a GEMTECH G5-5.56 suppressor.Ĭompared to the high-velocity (supersonic) unsuppressed condition, the combination of subsonic low-velocity ammunition and a firearm suppressor provided a reductions of 45, 38, 40, and 48 dB, peak sound pressure level at the muzzle, left, right ears and behind the shooter, respectively.I’ve shot those Beck guns myself (video of the subsonic: ). The peak sound pressure levels of a Remington 700. 223 caliber bolt-action rifle firing high-velocity (supersonic) ammunition using a GEMTECH G5-5.56 suppressor. Specific reductions depend on the ammunition and suppressor. As it happens, a lot of handgun ammunition is in and of itself. Anything faster is supersonic, anything at or around that speed is transonic, and anything below that velocity is subsonic. Main article: Suppressor § Subsonic ammunition and reduced sonic signatureĬombined with firearm sound suppressors, subsonic ammunition may significantly reduce sound levels compared to normal ammunition. have several only one left 150rd boxes of Winchester 9mm 124gr NATO for 100 each as well. Technically, any ammunition that achieves less than supersonic velocity is in and of itself subsonic, which is 1,126 ft per second. 223 rounds didn’t work as well as one would hope. AmmoSeek, LLC is not responsible for inaccurate product information displayed. This could have a negative effect on AmmoSeeks ability to obtain accurate (or any) information. Also, retailers web sites can change at any time. Extreme Shock Prez Jeff Mullins tells TTAG that the previous military-spec 127 grain ASP. does not vet or endorse any retailer listed on this site. These are designed from the start as dedicated subsonic projectile systems. 223 100 grain ASP (Advanced Subsonic Product) round specifically designed for civilian AR-15 modern sporting home defense assault rifles with suppressors. 45 ACP ammunition load, of a 230 grain bullet at 850 feet per second, is naturally subsonic.Īlternatively, specialized firearms and ammunition may be used to optimize total subsonic ammunition effectiveness. For example, the traditional American military standard. Some ammunition types were inherently designed with heavier, slower standard bullet weights and velocities. Subsonic ammunition with normal bullet weights often fails to properly function in such firearms. Prvi Partizan PPU Ammunition 223 Remington 55 Grain Soft Point (20pk). Subsonic loads for 9mm commonly use 9.5 grams (147 gr) bullets at velocities of 300 metres per second (980 ft/s).įor these ammunition loads, balancing bullet weight and velocity are required to ensure that the ammunition will still reliably cycle semi-automatic firearms. Winchester Subsonic Ammunition 22 Long Rifle (22LR) 40 Grain Subsonic Hollow Point. In this instance, heavier bullets are loaded in standard ammunition, which reduces muzzle velocity below the speed of sound.Īs an example, the very common 9×19mm Parabellum standard military round is a 7.5 grams (116 gr) bullet at velocities typically around 360 metres per second (1,200 ft/s). Standard calibers Subsonic versions of standard rounds 1.1 Subsonic versions of standard rounds.
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