![]() ![]() ![]() Total MSRP for these items was $1,095, and they were assembled into a functional AR pistol seconds after unboxing. To complete the setup, we picked up a nitride-finished 9mm bolt carrier group and a Breach ambidextrous charging handle, both from Aero. Aero notes that special hardened trigger pins are installed to withstand the “high demands of blowback AR platforms.” We paired it with an EPC-9 8.3-inch complete upper equipped with Aero’s Atlas R-ONE 7.3-inch M-LOK handguard. This includes a Mil-spec trigger and selector, Magpul MOE grip, EPC 7.7-ounce buffer, and Aero M5. We started our build with an EPC-9 complete pistol lower with SBA3 brace. We ordered an EPC-9 pistol lower and complete upper, then added this black nitride BCG and charging handle to finish it off. An extended mag release is also pre-installed.Ībove: Aero Precision sells EPC-9 lowers with various stocks and braces, and uppers ranging from 5.5 to 16 inches with several handguard styles. The bolt catch and takedown pin channel are both threaded for ease of assembly, and there’s a tensioning set screw to ensure a tight fit between the upper and lower. A last-round bolt hold-open mechanism - a feature many 9mm ARs lack - is built-in. ![]() Much like Aero’s popular M4E1 rifle-caliber receivers, the EPC receivers are machined from 7075-T6 forged aluminum, with an enlarged trigger guard and flared magwell. At time of publication, it’s only available in 9mm/.40S&W, but a 10mm/.45ACP variant is in the works. The EPC line is Aero Precision’s take on an optimized pistol-caliber AR and it consists of mix-and-match uppers, lowers, and builder kits, rather than complete carbines or pistols. | Photos by Nate Gerhart and Patrick McCarthy Aero Precision EPC-9 Review The end result is a smooth-shooting, compact weapon that can be used for a variety of tasks, from competition to defense.Ībove: With the brace compressed and the JK Armament suppressor removed, this EPC-9 can fit into a small backpack with ease.Įditor's Note: This article originally appeared in Issue 29 of our sister publication Concealment magazine. We built a 9mm AR pistol using components from the Aero Precision EPC ( Enhanced Pistol Caliber) line, and then modified it using aftermarket parts. Thankfully, there are ways to mitigate this. This translates to a recoil impulse that can feel a bit jarring despite the pistol caliber - it’s noticeably more harsh than a 5.56mm AR. Either way, rather than relying on a mechanical delay mechanism to slow down the bolt, it relies on the mass of the bolt and buffer system. Otherwise, we might call it downright crude. If we’re being generous, we’ll just call direct blowback simple. Since then, direct blowback has become the industry standard for 9mm ARs, with a few notable exceptions (for example, the radial-delayed CMMG Banshee featured in Concealment Issue 16 and the roller-delayed JP-5 we reviewed in RECOIL Issue 57). In subsequent prototypes, the design switched to a closed-bolt direct blowback system - this would carry through to Colt’s first production version, the 10.5-inch-barreled R0635 SMG. In the early 1980s, Colt began developing 9mm prototypes based on this platform, the earliest of which was an open-bolt submachine gun that fed from a modified Uzi magazine. ![]()
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