![]() The direct blowback operation system is often judged to have two opposing qualities: reliability and ammunition sensitivity. While good cleaning and upkeep is important for all firearms, blowback systems are known to take a good bit of abuse and keep on running. Additionally, the parts that do exist tend to be bulkier and stronger. Since there are fewer parts in a direct blowback system, there are fewer parts that can break. Similar in shape to a standard AR-15 bolt carrier group, the one for the SAINT Victor 9mm Carbine is simplified and specially weighted to offer the correct balance to the energy of 9mm loads. The simplicity of the system frequently is demonstrated through the long life and low maintenance of the system. While the engineering team designing the firearm must carefully balance the competing forces in the gun, the end product tends to be very dependable. The system used in the SAINT Victor 9mm Carbine is perfectly tuned for the gun and modern ammo.ĭependability. Direct blowback actions are generally considered to be very reliable. With an understanding of what’s happening inside a direct-blowback PCC, it’s easier also to understand the unique strengths associated with it. Springfield Armory, for example, uses this in its SAINT Victor 9mm Carbine. Sorry, an error occurred and we could not sign you up.Ī nice side-effect of this system is that it is usually extremely reliable, and this reliability is one of the primary reasons why companies overwhelmingly use this system in pistol caliber carbines. However, it is generally not suitable for high-powered cartridges that generate pressure too great for a reasonably weighted bolt and recoil spring to resist. It requires fewer moving parts than other firearm actions. The SAINT Victor 9mm Carbine uses the extremely reliable Colt-pattern 32-round magazine.īlowback operation is a relatively simple system that is considered to be a very reliable action. A blowback system feeds from magazines like any other semi-auto rifle. Additionally, the recoil spring must be strong enough to store the energy needed to cycle the bolt, but not so strong that it prevents the action from cycling. The mass of the slide or bolt must be heavy enough to prevent a premature backward motion caused by the pressure of the fired cartridge, but not so heavy that it completely prevents rearward operation. The above photo is a close-up view of the SAINT Victor 9mm Carbine’s bolt carrier group.Īs you might imagine, the mass of the slide or bolt is critical to ensure proper operation. This means that the sheer force generated by the cartridge going off pushes the bolt rearward, ejects the spent case and allows the bolt to carry a round forward into the chamber under spring pressure. Rather than relying on a mechanism to delay the breech’s opening, a direct blowback system relies on bolt mass and recoil spring pressure to keep the action closed long enough for chamber pressure to drop to a safe enough level for the action to cycle. There are no pistons or gas tubes to worry about.Ī direct, or simple, blowback operating system features what is widely considered to offer the greatest simplicity of any system found in modern semi-automatic firearms. A rifle like the SAINT 9mm Victor Carbine uses a direct-blowback design to operate the gun. While there are variations of blowback operation, we’re talking about the most basic version: simple, direct blowback. How Does a PCC Work?īlowback operation is a type of firearm action where the energy created by the firing of a cartridge is used to cycle the firearm’s mechanism and prepare it for the next shot. So, let’s dive into exactly how a direct blowback firearm functions. There are several factors that play into this, but chief among them may be the exaggeration of the system’s supposed drawbacks and the lack of exploration of its benefits. While the direct blowback system is not the newest or most advanced of operating systems, it is often underestimated by new shooters when they begin the search for a PCC. The author helps us understand how this 9mm carbine works. But on the inside, the Victor 9mm Carbine has a significantly different operating system. On the outside, all SAINT rifles appear similar. Here in the United States, the popularity of competition shooting means that the direct blowback system remains quite popular among civilians who compete with PCCs. One of these is the direct blowback system of operation used in pistol caliber carbines (PCC). While the AR is well-known for its direct gas impingement system (DGIS) of operation, there are some other options. Have you ever wondered how a 9mm carbine works? In this article, Sam Weitzner examines the differences between the direct blowback pistol caliber carbines and other semi-automatic systems like those employed by the AR-15.
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