: 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 "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: FGC-9 MkII Rev5
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. : Optimized for PLA+ (specifically eSUN or similar)
: It is designed to be built using 3D-printed components and standard, non-firearm regulated hardware (like metal tubing and springs). Early versions of 3D-printed guns, such as the
The MkII Rev5 utilizes a standard AR-15 buffer tube, grip, and fire control group (FCG). However, the lower receiver and the upper receiver are largely printed. The upper receiver of the FGC-9 is unique because it uses a clamshell design printed in two halves and epoxied or bolted together. This creates a rigid structure that houses the barrel and bolt carrier group.