I have a Sig Romeo 5 on the Kriss vector and a forward stubby grip. The carbine is stock with a Trijicon MRO on it. I have a Sig MPX carbine in 9mm, and a Kriss Vector carbine in 40 S&W. I have experience with two of its competitors. Velocities are averages of 10 shots measured with an Oehler Model 35P 12 feet from the muzzle.Wow, that is a pretty good looking rifle. SIG Sauer MPX PCC Accuracy Results Notes: Accuracy results are the averages of four five-shot groups at 50 yards from a sandbag rest. Trigger: Timney single-stage, 4.75 lb.Furniture: Folding five-position adjustable stock, SIG pistol grip, 15 in.Barrel: 16 in., 1:10 twist, SIG 3-port muzzle brake.Type: Short-stroke gas piston semiauto centerfire.With its big price tag and purpose-built design, the new MPX isn’t aimed at beginning shooters or the average person interested in home defense, but that’s not to say that it can’t perform double-duty as both a competition gun and home defender. They’re easier to aim than a handgun, are far quieter than a rifle even with a muzzle brake, and hold lots of bullets. Over the past few years I have come to believe that pistol-caliber carbines are perhaps the best choice for home defense for most people. That’s why Federal’s dedicated Syntech PCC load (a 130-grain bullet at roughly 1,130 fps) gives you a 145 power factor, far above the minimum 125 needed. Lighter bullets pushed faster generate more gas for that muzzle brake, and the result, counterintuitive as it sounds, is hotter ammo makes the gun shoot flatter. Competition shooters load their pistol ammo as soft as possible to reduce recoil in their pistols, but PCCs actually work better with hotter ammo. Here’s an interesting fact about 9mm carbines and competition. The other big improvement from the previous version is the lighter fore-end, which not only lessens weight but moves the balance point toward the shooter. For testing and just general fun, I mounted a new Trijicon SRO on the PCC using Trijicon’s QD flattop RMR mounts for the sight. As a result, pretty much everybody runs a non-magnified red dot on their PCCs. Unless you are competing at a dedicated PCC match, PCCs are run on the same stages as pistols, which means most of your shots will be well inside 20 yards. It was very crisp with a short reset and little overtravel. By contrast, the single-stage flat-faced Timney trigger on my sample of the new MPX PCC sample weighed in at 4.75 pounds. Most of the factory MPX trigger pulls were north of six pounds and gritty. Second on the list of needed improvements was a better trigger pull. However, as it came from the factory, that MPX carbine was far from perfect for competition.įirst, it was too heavy, but the new the PCC sports a lightened handguard that brings the center of gravity back and the weight down to six pounds, 14.5 ounces. That low recoil was due both to the SIG’s heavy-for-class weight and short-stroke piston operating system. They liked its large integral magazine well, but it was chosen among gamers mostly for its low recoil. Over the past few years, an older version of the MPX was a preferred pistol-caliber carbine among serious competitors. There is no buffer tube, so the MPX can be fired with the stock folded if you want extra credit for style points. There is a detent so it stays in the folded position. The stock is five-position adjustable for length, and it folds to the left side as well. × The controls are ambidextrous, and the crisp Timney trigger is a big improvement over the trigger found in the older MPX competition shooters used to flock to.Īll the AR-style controls on the lower receiver, as well as the charging handle, are ambidextrous. This operating system reduces reciprocating weight, reducing recoil. Instead of having a direct-gas-impingement operating system like most rifle-caliber ARs or being a straight blowback gun like most pistol-caliber ARs, the MPX uses a proprietary short-stroke gas piston system. While it will accept a few AR parts, the MPX is a completely unique design from the inside out. It free-floats inside a 15-inch aluminum handguard with M-Lok accessory slots at three, six and nine o’clock.įrom its appearance many people might describe the MPX as a “pistol-caliber AR,” but that description is not as accurate as you might think. The MPX PCC has a 16-inch barrel that is tipped with a three-port muzzle brake. The largest is the new MPX PCC, a 9mm carbine intended for PCC (pistol caliber carbine) competition, and right now it’s hard to find a hotter segment of the shooting market than PCCs. The smallest is the 3.5-inch-barreled Copperhead pistol. SIG’s MPX was originally designed as a submachine gun, but SIG has seen more success selling pistol and carbine versions of this interesting design.
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