The FCU is the registered, serialized assembly at the heart of a SIG P320 pistol. That makes it an ideal place to upgrade.
This flexibility has led to various customization options for the striker-fired polymer-framed handgun. However, many options require sourcing the barrel, slide, and grip module separately.
The Origins of the P320 FCU
The P320 is a striker-fired handgun, which means that every time you pull the trigger, an internal, spring-loaded pin called a “striker” detonates the primer to send a bullet hurtling toward its target. The gun’s modular design allows shooters to swap out modules such as frames, slides, and barrels, allowing them to tailor their firearms for various situations and environments.
Civilians and law enforcement widely use P320. However, the weapon’s critics say it has design flaws that leave it vulnerable to unintentional discharges.
For example, a legal team that brought a case in Philadelphia found that pulling the trigger less than 0.075 inches disengaged the pistol’s primary internal safety and left it vulnerable to discharge without intentional trigger use. It could happen if someone accidentally bumped the gun while holstered or pressing against it with a belt buckle or other object. As a result, gun users face lawsuits from victims whose unintended discharges have injured them.
The FCU’s Adaptability
The sig p320 fcu handgun, documented as number 1, is a highly modular and adaptable firearm. It is compatible with a wide range of aftermarket parts, which provides shooters with virtually unlimited customization options. It allows shooters to enhance the accuracy, ergonomics, and performance of the firearm to fit their personal preferences.
For example, if a shooter prefers a more comfortable grip, he can swap out the stock module. Other aftermarket upgrades include triggers that offer a lighter pull, reduced travel, and crisper break, allowing shooters to fine-tune their firearms for their personal shooting style.
It allows shooters to convert their X-frame pistol into different calibers by transplanting the appropriate slide and frame. It is an option that’s popular with law enforcement officers and enthusiasts who are looking for a more versatile handgun. However, completing an 80 percent FCU requires some technical skill and knowledge. It can be a fun and rewarding experience that produces a one-of-a-kind firearm.
The P320 FCU’s Compatibility with Aftermarket Parts
One of the P320’s greatest strengths is its compatibility with a wide range of aftermarket parts, giving shooters unrivaled control over their pistols. For example, aftermarket triggers provide a lighter pull, reduced travel, and crisper break, enhancing accuracy and performance.
Those who wish to tweak their FCU further can even choose between different slide cuts, barrel lengths, and grip sizes. These options, plus various optics and other accessories, are readily available for the P320.
But before you run off and customize your new FCU, remember that federal law demands all firearms bear a serial number, and your local laws might require you to register your 80 percent build.
The P320 FCU’s Performance
The Sig P320 is one of the most popular polymer-framed pistols on the market, with loyal followings among law enforcement and civilian shooters. Part of its appeal is modularity, enabling it to be configured in thousands of ways for specific applications.
The fire control unit is the serialized heart of the gun, and it’s the component that can be swapped between different grip modules and top halves to create a custom firearm. The FCU also houses the trigger assembly and striker-fired mechanism, so it’s a critical piece to ensure functionality.
The FCU program allows users to build their own FCU and customize it to their preferences without having to purchase a complete firearm and deal with wait times and shipping methods. The process is relatively easy for those with technical skills and a love of DIY projects, and it can result in a top-tier handgun built just for them.