M39 EMR Airsoft Rifle w/ CYMA Version 7 Gearbox

thingiverse

Updated on 11/7/19, check the latest information below for better results! I downloaded a pre-existing M14 EBR model from a Sketchup upload. The original model credit goes to Rabid Beagles over there. https://3dwarehouse.sketchup.com/by/wujoberto Then I used Blender to scale the model precisely and researched the differences between the M14 EBR and an M39 EMR. They both utilize Sage International's EBR chassis, but the M39 features a 22" barrel instead of an 18" barrel. I edited the model to make it 3D printable piece by piece to fit on my compact bed and essentially hollowed it out to ensure it could accommodate the gearbox. The entire process took me about a month with a total print time of approximately 90 hours. The whole rifle utilizes around 1100 grams of material, depending on your print settings. I went through roughly a 1.2kg on test prints to guarantee everything fits together. The most finicky part is the magwell. It's still not perfect and requires modification if you want it to feed properly into the hop-up chamber. If you attempt to make this, the STL files need to be upscaled to 1000%. The holes are also not precise 1:1 sizes of an actual M39 model. I ended up using wood screws and tape because I got impatient and really wanted to complete this. This is NOT a straightforward print. It still demands a lot of work to assemble it with proper screws. Overall, this was a really fun project. And also my very first airsoft gun (to own, use, make)! Update 11/4/19 Assembly video, will update files soon. https://youtu.be/9sg_z99PBuI Update 11/7/19 Updated STL files. These ones are good to print. Magwell feeding issue is also resolved. The stock, buffer tube, and pistol grip are not included in the STL files. I've used these ones here. I've edited the model so people can swap out whatever M4 airsoft grips they want and M4 style stocks. Total print time was approximately 63 hours for me excluding the stock, buffer tube, and pistol grip. I utilized about 675g of filament. With the other parts included it will reach a little less than a kilogram. with the cost of filament and hardware, you can have a cosplay sniper for under $20!! Thingiverse is being uncooperative and not updating my publishing properly. I'm trying to delete the old photos and STL files but I can't so don't use those. Please print responsibly! This is in no way meant for real firearms and only as a prop or for backyard airsoft. I don't recommend fielding this unless you print in something stronger like Nylon or ABS. Stock: https://www.thingiverse.com/thing:3546860 Buffer Tube: https://www.thingiverse.com/thing:3717605 Pistol Grip: https://www.thingiverse.com/thing:3728030 Internal Airsoft parts purchased off Evike (~$135) CYMA Version 7 Gearbox w/Motor CYMA M14 Complete Hopup and Inner Barrel set (570mm) Matrix midcap M14 magazine 1600mAh small tamiya butterfly type battery Hardware required (~$15) M3x0.5x6 - 11 screws (Gearbox cover plate, magwell, grip adapter, upper receiver) M3x0.5x8 - 8 screws (Handguard, Trigger guard plate) M3x0.5x10 - 3 screws (Rear sight, buffer tube attachment) M3x0.5x12 - 12 screws/nuts (Picattiny rails) M3x0.5x16 - 6 screws (Upper chassis) 100 grit Sandpaper (something coarse less than 220) Superglue My next project will likely be something like an L96 sniper or an HK416.