The "detailed paper" you are looking for is typically found within the . Revision 5 specifically streamlines the assembly guide and bolt-making process.
Historically, the FGC-9 bolt was a welded assembly of metal rods and printed spacers. The Rev5 introduced a one-piece printed bolt body with massive pockets for poured epoxy-resin or tungsten putty for weight. More importantly, Rev5 standardized the firing pin channel using a simple M4 threaded rod, eliminating the need for complex springs. The bolt face is now reinforced with a steel breech washer, preventing the printed material from peening under pressure. 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. The "detailed paper" you are looking for is
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 Rev5 introduced a one-piece printed bolt body
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.