FGC9 MKII 3/4" Threaded Rod Bolt Housing with floating firing pin

thingiverse

This housing was inspired by the gentleman over at TECH GUNZ on youtube. If you haven't seen his videos I would highly advise it. https://www.youtube.com/watch?v=o7AhGsrtK6U&t=96s This is an awesome video, because it uses parts that are more commonly available in the U.S. I slightly widened the inlet for the steel rods to better accommodate the increase in diameter of the threaded rods. Additionally, as noted on one of my other designs, if the lower steel bar isn't placed in the housing correctly, the firing pin can slip past the retaining screw and drop out of the bolt all together. Also, I have notice the firing pin springs tend to wear down very quickly or just straight up tangle up and stop working. To remedy this, did two things. First I narrowed the opening on the back of the housing that the firing pin travels through and removed the plastic that stopped the shaft collar from touching the back of the bolt. Second, I made a firing pin out of 1/8" steel rod with a 3/8" OD shaft collar. Because the firing pin was make out of 1/8" rod, I drilled a 1/8" hole in the bolt. No wider. These two things prevent the firing pin from being lose and slipping past the retaining screw and allow for a free floating firing pin. I modified the length of the firing pin to stick out past the bolt 1.5mm on the firing end and about 5 mm past the firing pin retaining screw on the hammer end of the bolt. THIS HAS WORKED SO DAMN WELL. NO MORE BURST PRIMERS. NO MORE REPLACING THE FIRING SPRING. NO MORE FIRING PIN DROPPING OUT AND BECOMING LOOSE IN MY RECEIVER. IT IS AMAZING. To reiterate: I made the firing pin out of 1/8" steel rod and a shaft collar with 1/8" ID and 3/8" OD. Very easy to find or buy online for cheap. I made the bolt out of the 3/4" threaded steel rod for the top and bottom bars and a 1/8" steel rod to replace the 3mm drill bit that strips the rounds out of the magazine. I used a 1/8" drill bit to drill the hole for the firing pin. Print Settings Nozzle size: 0.40mm Layer height: 0.16mm Infill density: 100% Nozzle temperature: 230°C +-5°C Bed temperature: 60°C Cooling: 50% Support Overhang Angle: 85 Build Plate Adhesion Type: Brim Disclaimer: As you all know, producing the FGC9 carries with it inherent risk. I do not claim any responsibility for injuries that may result from using these models in a way that may cause injury. If you choose to use this product you are responsible for yourself. If you like this file please consider donating: https://www.paypal.com/paypalme/WyldTurkey