![]() ![]() 223 AR has morphed from a varmint getter to a full-fledged deer-, bear- and elk-stopper by simply changing the upper - no new FFL transfer required. 458 upper available from Rock River Arms, Teppo Jutsu, or other custom builders, get loaded ammo from SBR Ammunition, Corbon, or Reeds and go. 223, same buffer spring in the buttstock, same everything. 458 SOCOM is that nothing but the upper need be changed - same magazine as the. The real cleverness in the design of the. Buffer springs, unique magazines, different bolt, etc., are required. Parts need to be changed to make them function. ![]() They are fine cartridges that get the job done, but they both require that the rifle be modified. ![]() 50 Beowulf were created to fill this void. The rising popularity of the AR-15 and its rapid move to the dark timber has generated a need for that kind of muscle in the AR. Big, heavy bullets moving at moderate velocities are proven game-stoppers when a fast stop is the vital objective. 45 caliber options to choose from, ranging from the. In the world of bolt actions, levers, single-shots, and even handguns, hunters have an abundance of big-bore. It's an odd set of dimensions, but, as we will see, an extremely clever design for its purpose. The case headspaces on that minimal shoulder (see drawing). In short, a short, fat case (1.575) with a very small rebated rim (.473), minimal taper, and a slight shoulder. The end result is a bit of an odd-looking case, but one that accomplishes all the goals. The cartridge had to be suppressor-friendly, meaning it had to be capable of muzzle velocities below 1,000 fps (subsonic) and still reliably cycle the action in semi- or full-auto. These were the design limitations Marty ter Weeme had to work around to give the little AR-15 real muscle, but it didn't stop there. 223 or timing goes to pot, you tear things up, and reliability suffers. The pressure and burn rate must also be close to that of the. You can make a fatter case work, but you can't be very much longer. Because of the small size of the AR-15 action and receiver area, and the timing of the bolt cycle rate, you can't really use cartridges much longer in overall length than the. The Government bought it, Colt bought the design rights from ArmaLite, and AR-15s wearing a Colt logo tromped the rice paddies of Vietnam for years, going on to become the primary military firearm to this day. 308 AR-10, made it smaller, chambered and timed it for a new, hot. That sent all the competitors who were bidding for the lucrative new rifle contract back to the drawing board.ĪrmaLite engineers simply took their. 30 caliber and move to a smaller, lighter, faster round. As is often the case with government requests, about halfway through the trials, the higher brass decided the emerging dust-up in Asia would be a close quarter affair, and it might be better to abandon the bulkier, heavier. ArmaLite's entry, called the AR-10, was a semi-auto of simple design (with a full-auto option) chambered in. 30 caliber was the way to go, and the early designs submitted were in. Most of the companies bidding for the new gun contract assumed another. A Bit of AR Historyīack in the late '50s, the military decided to replace the venerable Garand. 45 caliber bullets from a standard size AR-15 with a proper barrel and chamber was born - enter the. In 2000 a sledgehammer cartridge that would launch 250- to 600-grain. Marty ter Weeme, founder of a company called Teppo Jutsu, L.L.C., went to work. The consensus was a one-shot stop would sure be nice. It seems it took multiple hits to permanently take the opposition "out of the game" in Mogadishu, Somalia. It was at an informal gathering of special ops personnel, specifically Task Force Ranger, when the subject of stopping power came up. 458 SOCOM (.458 Special Operations Command) was reportedly given birth over a barbeque and some cold brew. ![]()
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