Mkii Rev5 !full!: Fgc-9

: Closed-bolt, blowback-operated semi-automatic.

The "Rev5" iteration is a mature evolution of the platform. Early versions of 3D-printed guns, such as the Liberator, were single-shot, fragile, and unreliable. The FGC-9 is a magazine-fed, semi-automatic weapon. The MkII Rev5 specifically addressed several failure points:

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. FGC-9 MkII Rev5

The is a semi-automatic, 9mm pistol caliber carbine (PCC). Unlike traditional firearms that require milling machines, lathes, and specialized knowledge to manufacture from scratch, the FGC-9 is designed to be built using a standard desktop FDM (Fused Deposition Modeling) 3D printer and readily available hardware store components.

Руководство FGC-9 MkII на русском - Internet Archive : Closed-bolt, blowback-operated semi-automatic

The genius of the FGC-9 MkII Rev5 lies not necessarily in its performance as a firearm—which is functional but utilitarian—but in its engineering for accessibility . The design philosophy centers on "Zero Percent" manufacturing. In many jurisdictions, a firearm receiver (the legally controlled part) is considered a "gun" even if it is 80% complete. The FGC-9 bypasses this by using a receiver that is 0% metal—printed entirely out of plastic filament.

The project is often cited in academic and legal circles as a primary example of "hybrid" construction. This approach combines 3D-printed polymer components with common metal hardware. Historically, the evolution of these designs has focused on increasing the durability of printed parts and simplifying the assembly process for individuals using consumer-grade equipment. Such advancements have made the topic a focal point for researchers studying the future of decentralized manufacturing. The FGC-9 is a magazine-fed, semi-automatic weapon

: 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.

The "detailed paper" you are looking for is typically found within the . Revision 5 specifically streamlines the assembly guide and bolt-making process.

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.