Heizer Defense Pko-45 Semi Auto Pistol 45 Acp 275 Barrel Review
Information technology seems some of the world's greatest inventions have started with a sketch on the back of a napkin. Then information technology was with the Heizer Defense PKO-45. According to Tom Heizer, he, his begetter and sister were sitting at a Houston restaurant tabular array. They were there for the 2013 NRA Annual Meetings & Exhibits and had just introduced the PS1 pocket shotgun, a break-action, single-shot handgun chambered for .45 Colt cartridges and .410-gauge shotshells. Every bit Tom put it, "Dad said, 'Hey, I've got a skillful idea for a semi-auto pistol. It will have less moving parts and we tin build it incredibly sparse and notwithstanding chamber it for a powerful cartridge.'"
As they looked over his shoulder, Charlie Heizer sketched what would become the PKO-45, a semi-auto chambered for the mighty .45 ACP, weighing just 25 ounces and measuring 0.8 inches thick. Blowback-operated, the PKO-45 uses a stock-still barrel and a relatively calorie-free recoil spring. While the mechanical parameters of this gun might take a team of engineers with the latest computer programs and months of time to blueprint, Charlie Heizer did it in just minutes with a ballpoint pen.
Heizer's Ingenuity
Born in 1933, Charlie Heizer grew up in Hungary near the Austrian border and witnessed the horrors of war immediate with his village being occupied starting time by German and so Russian troops. Subsequently the war, discarded armed services equipment became a treasure trove for the young man, who used his father's machine and blacksmith shop to modify the parts. Farm equipment, motorcycles and firearms were some of Heizer'south favorite projects to build. At i signal he establish an former shotgun whose butt had been damaged past the bombing. Heizer rebuilt the shotgun, cutting downward the barrel and handloaded his ain shells using pieces of pb pipage for shot, and he was able to put rabbit and quail on his family's dinner table.
An interest in all things mechanical led Heizer to get a bachelor's degree in mechanical engineering science and a master's degree in internal combustion engines from the Budapest Institute of Technology. Simply months away from receiving his doctorate degree, Heizer escaped the Hungarian Revolution in 1956 and landed in the United States with a toothbrush, a thermodynamics textbook and no working knowledge of the English language. Eventually he met and married some other Hungarian refugee and started a family. Heizer established a small motorcar shop and landed a contract to make parts for Douglas Aircraft, and this led to other jobs with Boeing, Lockheed and Airbus equally well as many of their suppliers. Fifty-five years afterwards its inception, Heizer Aerospace at present occupies over 300,000 foursquare anxiety of manufacturing infinite.
Merely Heizer never abandoned his love of firearms and, using the excuse of diversifying, he established Heizer Defense to build guns. His extensive knowledge of steels, alloys and precision machining are as relevant to firearms as they are to aviation.
I spoke to his son, Tom, recently, and he explained that every metal used in the PKO-45 is aerospace-grade stainless steel. "We machine everything in-business firm and fifty-fifty bore the gun's butt and rifle here at our manufacturing plant in Pevely, Missouri."
A Closer Await
The PKO-45's barrel is just 2.75 inches long, and its placement in the frame is the central to the gun'southward controllability. The elderberry Heizer designed the gun with a fixed barrel and placed the recoil spring over the barrel. This translates to a lower diameter centrality in the shooter's paw, minimizing muzzle flip.
Before I had a chance to handle the PKO-45, I was concerned that a blowback-operated gun chambered for the .45 ACP would accept a horrifically strong recoil spring, simply I was pleasantly surprised to find that this wasn't the example. Despite the fact that the gun uses no sort of locking mechanism, it is piece of cake to manually chamber a circular. Heizer used a small-bore, tightly wound recoil spring that possesses plenty force to retard the slide'south rearward velocity and sleeping room the next round in the magazine.
The PKO-45 has a tube fastened to the frame, just higher up the barrel's sleeping accommodation, and it extends almost all the manner to the rear of the frame. The recoil jump slides within the tube, which keeps information technology from kinking when the slide reciprocates. At the front of the slide, a takedown pin retains the recoil jump guide.
Heizer Defense machines the PKO-45's frame from stainless steel in two halves and joins them, not by welding, but past using 5 screws. The halves are expertly fitted, and it's hard to discern the seam. I asked Tom Heizer if the finish-user should e'er separate the two halves. "There's actually no reason to. We have done extensive testing and fired 5,000 rounds through 1 of our test guns. We separated the halves simply to cheque for wear and found the gun's internals to be very make clean."
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To keep the gun as trim as possible, Heizer designed the slide to run on rails inside the frame. An external extractor is as well used on the PKO-45. Heizer places a small square of hardened steel on the slide at the point where the slide stop engages it to minimize wear. There'southward a slide stop lever located between the manual thumb safety and the 1911-fashion magazine release. It is positioned appropriately for manipulation while maintaining a firing grip.
At the front of the PKO-45's frame is a grip safety. The pistol cannot fire unless this safety is depressed. In utilize, it is not noticeable and provides an boosted safeguard to preclude an adventitious discharge. The frame is undercut at the junction of the frontstrap and triggerguard, and this helps the shooter go a loftier grip on the gun. Additionally, the exaggerated heel of the frame helps the shooter lock the pistol into a secure firing grip.
An internal hammer is used on this gun—it'southward not striker-fired—and the PKO-45 has an ambidextrous manual thumb safety. The pivoting safety will be familiar to 1911 users; up for "prophylactic" and "down" for fire. In use, I often found myself visually checking to see if I had disengaged the safety, equally the levers are very low profile. In my opinion, the levers should exist slightly more than pronounced for positive engagement.
Range Time With The PKO-45
The trigger pull on my pre-production test sample was extremely well-baked at well-nigh 6.5 pounds with a positive reset. Production guns will have sights manufactured by an outside contractor, simply I had no problem aligning the low-profile sights. The accuracy was better than I would have hoped for with a gun possessing a two.75-inch barrel, only information technology does accept a decent sight radius of about v.5 inches. I gear up my targets at 10 yards and fired v-shot groups with each load, with the all-time groups listed hither.
Ruger'south new 118-grain ARX load printed the all-time five-shot grouping. This round continues to impress me and about always turns in the all-time accuracy regardless of the caliber tested. It has very calorie-free recoil yet functions well in everything I take shot information technology in, and its point of affect is not noticeably different than the point of aim. It also possesses the second highest energy of the rounds I tested. CorBon's 200-grain +P JHPs churned upwardly an amazing 392 pes-pounds of energy (fpe) and printed a 1.5-inch group at ten yards.
I set up a standard USPSA target at 5 yards and fired 10 magazines, five rounds each, rapidly into the target. Using Filly'due south 230-grain National Match FMJs, all of the rounds hit the center "A" box. At 15 yards, I was able to easily double-tap a steel target. The PKO-45 is very controllable and does not have the torque many of the alloy-framed, subcompact 1911s possess. The gun's depression bore axis and well-designed grip account for its shootability. The gun recoils straight back into the hand with piddling cage flip.
Disassembly of the gun is an easy matter and does not involve any tools. After removing the mag and ensuring the chamber is empty, appoint the thumb safe and place a finger over the recoil spring guide on the front of the slide. On the left side of the slide, near the muzzle, is what appears to be a lever but in reality is more than of a pin. Turn this lever and remove it from the slide. Now permit the recoil bound guide, under tension, to exit the slide. Remove the guide and jump, and then pull the slide rearward and off the frame. That'southward every bit far as yous should ever need to detach the PKO-45 for routine maintenance and cleaning.
More than Innovation
Heizer Defense will offer the PKO-45 in a variety of PVD-coated slide colors like Champagne, Copperhead, Ghost Grey and Technical Black, with the frame retaining its natural argent stainless steel color. The PVD coating is lubricious and eliminates the need for heavy lubrication on the slide track.
Despite the fact the PKO-45 is just launching, Heizer Defense shows no signs of losing momentum. Already in the works is a PKO-45 with a titanium frame, which will shave most 4 ounces or a quarter-pound from the gun's weight. Additionally, a version will exist offered with an extended and threaded cage for suppressor use. The blowback operating system and fixed barrel volition eliminate some problems normally associated with adapting a suppressor to a dropping-barrel semi-auto. Heizer Defense also plans to offering a semi-automatic 9mm pistol with an aluminum blend frame in the about future.
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I fired over 300 rounds through the PKO-45 during the course of my evaluation. Information technology is authentic, reliable and controllable, and its thin dimensions, rounded contours and light weight are certain to make information technology a elevation option for concealed comport. A product of a mechanical genius with an inventive bent, the PKO-45 will appeal to those who recognize quality and innovation and demand the all-time.
For more information, visit heizerdefense.com or telephone call 888-965-0972.
Source: https://www.personaldefenseworld.com/2017/08/heizer-pko-45-pistol/
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