The pressure and burn rate must also be close to that of the .223 or timing goes to pot, you tear things up, and reliability suffers. What does all this have to do with the .458 SOCOM? If you're like me you soon get pretty suspicious of gun writers who seem to get sub 1-inch, 100-yard groups from everything they shoot. This upper is a great option for other large bore calibers like the .450 Bushmaster and .50 Beowulf. 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 .30 caliber and move to a smaller, lighter, faster round. The larger ammo will even use .223/5.56 magazines, though a standard capacity thirty round magazine will only physically fit nine .458 rounds. Traveling here to there, a little fishing might be good for what ails you. A bit on the results before I go on. A Hornady Interlock 300 grain round will hit with the force of approximately 2,300 foot-pounds at the muzzle, compared to 1,293 foot-pounds for the M855 5.56 round. In 2000 a sledgehammer cartridge that would launch 250- to 600-grain .45 caliber bullets from a standard size AR-15 with a proper barrel and chamber was born — enter the .458 SOCOM. An expert offers some tips for night fishermen. Big, heavy bullets moving at moderate velocities are proven game-stoppers when a fast stop is the vital objective. The conversion process typically takes thirty seconds or less. ARAK-21® Features Components of the ARAK-21® Upper Receiver: The ARAK-21® is a gas piston actuated, complete upper receiver assembly designed to seamlessly interface with the standard AR-15 platform. Now, your .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. The .458 SOCOM round is often compared to the 45-70 round favored by the U.S. Army and buffalo hunters in the 19th century. Most of the companies bidding for the new gun contract assumed another .30 caliber was the way to go, and the early designs submitted were in .30-06 or .308. ArmaLite engineers simply took their .308 AR-10, made it smaller, chambered and timed it for a new, hot .22 based on a blown-out .222 called the .22 Special, later named the .223, and resubmitted it as the AR-15. One is the military. I wish an 18- or 20-inch barrel were available. At two hundred yards the Hornady round drops about ten inches, and at the four hundred yard mark the round drops about 100 inches. Find 458 Socom Reloading Dies, and 458 Socom Die Sets for sale here: Get the right 458 SOCOM Die or 458 SOCOM Die Set for your press here at Midsouth. As of now, they only offer a 16-inch chrome barrel with a flash hider (good to protect the crown, even if you're not concerned about flash), and no front sight. The Rock River line is known for quality, and this rifle is no exception. The Aero Precision XL Upper is forged from 7075-T6 aluminum and features an enlarged ejection port, the XL Upper Receiver is your best choice when you're planning a build to send big rounds down range. AR-15 .458 SOCOM Upper Build with 16" Barrel and 15" Keymod Super S... Add to Cart. JHP (High Power) is widely known as one of the most popular .458 SOCOM rounds. Maybe they have a magic trigger finger. There are several ways new cartridges come into the world. A few hunters offer some tips for camouflage for all seasons and hunting... Want to minimize the wear and tear on your wheels when you're out on the hunt? This factory load from this unmodified rifle never exceeded 2 inches at 100 yards, with most groups holding at 11⁄2 inches and several sub 1-inch clusters in the mix. Kyle Mizokami is a defense and national-security writer based in San Francisco who has appeared in the Diplomat, Foreign Policy, War is Boring and the Daily Beast. Read an account about a wolf hunt in the wilds of Ontario -- at temperatures as low as 25 below zero. A .458 upper can transform a rifle from a .223/5.56 target and self-defense rifle to a big bore, big game rifle. In most cases a longer barrel allows the pressure created by burning gunpowder to give a bullet extra push, but the developer states that complete powder burn with the stock 300-grain cartridge is achieved with just a 9.5 inch barrel. The .308, .223, 7mm Mauser, and venerable .30-06 were all created this way. The upper receiver assembly contains all of the essential parts of the rifle including the barrel, bolt carrier and firing pin, among others. A lot of powder room was left in that case. Parts need to be changed to make them function. This AR-STONER™ carbine length upper features a 458 SOCOM bolt carrier group, parkerized finish, low profile gas block, and a heavy profile barrel. new. That's a tall order. .458 SOCOM was developed in 2000 as an upgrade for the standard M4/M16/AR-15 family of rifles. The .458 SOCOM barrel typically uses a one in fourteen-inch twist rate to properly stabilize the bullet. For smaller game, AR-15 owners with receivers in both calibers can simply switch back from .458 to .223/5.56. As a result, a shooter can train with and shoot .223/5.56 ammunition and swap upper receivers only when necessary. ArmaLite's entry, called the AR-10, was a semi-auto of simple design (with a full-auto option) chambered in .308. The .458 SOCOM (11.63×40mm) is a moderately large round designed for a specialized upper receiver that can be mounted on any AR-15 pattern lower receiver. 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