PATRIOT ORDNANCE P415-7 MRR 5.56mm

POF’s P415-7 operating components consist of gas piston, op-rod, and…

POF’s P415-7 operating components consist of gas piston, op-rod, and regulated gas plug. All working components are hard chromed and NP3 plated for durability, reliability, and easy maintenance. Seen here with Aimpoint Micro T-1, SureFire M300, Magpul Angled Fore Grip and Laser Devices’ DBAL-A2.

POF-USA or Patriot Ordnance Factory, continues to set new standards of innovation in carbines for tactical use. Anyone who has ever had to clear a building or exit a cruiser knows that within the bounds of reliability and accuracy, shorter is better. POF-USA manufactures some of the most reliable short-barreled carbines on the planet. The subject of our current evaluation is POF’s LE/Military Only P415-7 MRR (Modular Railed Receiver) Carbine. Like all POF rifles and carbines, the P415-7 sets new standards of reliability for the venerable AR platform.

What makes POF’s rifles and carbines truly different? Suppose we told you that POF’s rifles and carbines required no lubrication? Suppose we told you that it really didn’t need regular cleaning, either? Finally, suppose we told you that POF AR’s would run over 20,000 rounds without a failure? Independent testers have attempted to literally shoot POF rifles and carbines to the point of failure, but as far as we know, nobody has been able to do so. POF’s carbines are so reliable, especially in hostile environments such as Afghanistan and Iraq, where Special Forces “operators” are purchasing POF- USA upper receivers out of their personal funds for deployment.

patriot-ordnance-p415-7-mrr-556mm-bP415-7’s forend mounting rails allow the use of accessories such as this Laser Devices DBAL-A2.

POF AR-type rifles are truly unlike any other. Externally, the most obvious difference between the P415 and others is the patented Predator upper receiver that not only features an uninterrupted full-length Mil-Std-1913 top rail and rails at the handguard sides and bottom, but also free floats the barrel, enabling mounting accessories without affecting the rifle’s zero. Our P415 came with a 7.25-inch barrel, but is also available in longer lengths up to 18 inches. The P415 nitrate casehardened, “5R” barrel is fluted along its length for rigidity, and heat dissipation. The flutes offer a greater surface area, so heat is more rapidly dispersed that with standard heavy barrels. Flutes also stiffen the barrel and improve accuracy by reducing barrel vibration as the rifle is fired.

The test carbine also came equipped with a Vortex flash suppressor, one of the most effective devices available. Fit and finish of the P415 are excellent. I was particularly impressed with the mating of upper and lower receivers with absolutely no “play” whatsoever. Like every POF firearm I have evaluated, this POF P415 is one of the best-assembled AR-type rifles I have ever seen.

One of the major differences between the P415 and any other is the patented gas system that eliminates the inherent problems associated with Stoner’s original design. The original AR direct impingement gas system not only blows large amounts of fouling and particulate matter back into the receiver, but also causes excessive heat to be transferred to the receiver area in rapid semi-automatic or full-automatic fire. There have been attempts to solve the AR’s gas system problems in the past, but POF is the best one I have seen. The P415 gas system consists of a regulated (normal and suppressed modes) gas cylinder plug, a 6-inch chrome-lined gas cylinder with a chrome-plated stainless steel piston and operating rod that impinges against a reinforced bolt carrier key. Unlike some other “op rod” systems, there are no springs on the Predator rod. Heat from sustained firing may damage springs that surround op rods that are in close proximity to the barrel. This is especially true in select-fire rifles. The P415 gas system is self-regulating.

The P415 system can be easily and quickly disassembled by simply pressing in on the gas cylinder plug button while rotating the plug clockwise. Once the plug is removed, the piston and operating rod fall out when the muzzle is pointed down. Reassembly is accomplished by simply dropping the rod back into the gas cylinder with the muzzle pointed up. If it doesn’t fall into place, all that is necessary is to shake the upper receiver — the rod will fall. The piston is replaced with the gas rings forward. The plug fits only one way and cannot be incorrectly reassembled. All that is necessary is to push the plug into place, press the locking button and rotate the plug counterclockwise.

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