Fgc-9 Mkii Rev5 [2021] | Premium — TIPS |
: Laws regarding the manufacture of 3D-printed firearms vary significantly by jurisdiction. In many countries and some U.S. states, manufacturing such a device without a license or serial number is illegal.
The FGC-9 is a semi-automatic, blowback-operated 9mm carbine. The "MkII" designation marked a massive overhaul from the original model, introducing a simplified bolt, a captive spring system, and a fully ambidextrous magazine release. The (Revision 5) is the current gold standard of the MkII line.
Previous MkII models used a direct AR-15 hammer spring, but the geometry often led to "hammer follow" (the hammer dropping before the bolt is fully closed). The Rev5 modifies the sear angle by 3 degrees and adds a physical over-travel stop. The result is a crisp, consistent trigger pull that rarely exceeds 8 lbs—a massive improvement over the gritty 12-14 lb pulls of the Rev3.
One of the quietest but most critical changes in Rev5 is the ejector. In earlier versions, the ejector was a separate printed piece glued into the magazine catch. Rev5 integrates the ejector into the main lower receiver geometry, machined from a single sheet of 1.5mm spring steel, then bent at a precise 11-degree angle. This virtually eliminated the "stovepipe" malfunctions that plagued humid-environment prints. FGC-9 MkII Rev5
The FGC-9 MkII Rev5 is not the most elegant firearm ever made. It will not win beauty contests, and it will not outlast a stamped-steel Kalashnikov. But as an engineering solution to the problem of prohibition, it is unmatched.
The most revolutionary aspect of the FGC-9 DNA is the ECM barrel. Using salt water, a 12V battery, and a 3D printed rifling mandrel, the Rev5 allows a user to rifle a smooth steel tube from an auto parts store (hydraulic line) into a fully rifled 9mm barrel. Rev5 introduced a "centralizing jig" that reduces the bore eccentricity error from 0.5mm to 0.1mm, making subsonic suppression possible.
: Optimized for PLA+ (specifically eSUN or similar) for the frame/receivers. Using other materials like standard PLA or PETG is discouraged due to potential reliability and safety issues. : Laws regarding the manufacture of 3D-printed firearms
: A common repository for the Rev5 file pack, which includes the detailed instruction manual.
As of 2026, the Rev5 represents the most refined, reliable, and widely distributed version of this iconic semi-automatic carbine. For enthusiasts, activists, and engineers studying the limits of additive manufacturing, the Rev5 is not just a file set; it is a case study in decentralized design, mechanical pragmatism, and the relentless pursuit of accessibility.
The FGC-9 MkII Rev5 transcends its mechanical function. It is a political statement in plastic. Jstark1809 (who passed away in 2023) designed it as a response to the German Weapons Act’s prohibition on standard firearm components. The ethos was simple: If a government bans the sale of barrels, bolts, and triggers, we will make them from raw stock. The FGC-9 is a semi-automatic, blowback-operated 9mm carbine
The acronym stands for "F**k Gun Control." The name itself is a political statement from its creators, signaling the intent behind the project: to create a functional firearm that bypasses legislative restrictions on commercial sales and ownership.
The study of these designs provides insight into how decentralized communities collaborate to solve complex engineering challenges using home-based manufacturing technology. It is important to note that the legal status of manufacturing such items varies significantly by jurisdiction, and many regions have strict regulations regarding the production and possession of functional mechanical devices.
Later versions often incorporate modular attachment points, such as those compatible with common accessory standards. This allows for the addition of various grips or stocks, reflecting a trend toward more user-centric and customizable digital hardware designs.