40mm grenade launcher (airsoft)

thingiverse

As of 5/27/15 I have been notified that there is a design flaw that makes the unit non functional, thanks to meendiz for bringing it to my attention details below. It has been brought to my attention that the barrel diameter is improperly sized to accept 40mm grenade shells as i have mistakenly sized the external diameter as 40mm rather than making the internal diameter 40mm, i will try to have the updated files poseted by the middle of June or sooner, i apologize to anyone who may have spent time and materials printing the defective unit, please bear with me this is a prototype and my first heavily detailed design, thank you for your patience. This is a prototype for a 40mm grenade launcher for use with 40mm Airsoft gas grenades, this is my first attempt at making something like this so it may need a fair amount of sanding and fine tuning before it actually functions, some assembly required, always use eye protection when shooting airsoft replicas, thank you!Major update time! (3/31/15) So, I started on this prototype on 3/30/15 and now its time to post a revised version! I spent about 3 hours cleaning up the edges, adding a few new things, changing some others and overall making a better launcher (I hope)Changelogadded slots in top of grip/receiver for the latch railsadded front and rear "iron" sightsadded some makers markings on the backside of the grip/receiverfixed the problem of a free-floating firing pin (I hope)cleaned up the edges on the trigger and grip for better ergonomics (the grip will require some sanding)re sized latchfixed the possibility of latch coming off if pulled too faradded cutout on side of barrel for easier reloading *shortened firing pin for better fit That's all for the changelog so far I will remove the old files and add the new ones along with a better set of instructions and an exploded model for you all to look at. Instructions I used TinkerCad to create this thing, i used a few reference images and some physical parts to get measurements, a few hours of my life, and caffeine to create this little thing Instructions for assembly 1) Print each piece sand and/or refinish each part as needed 2) take the trigger and firing pin parts, attach them and ensure they fit together securely and move freely (sand the contact points as needed) 3) take the grip, trigger/firing pin assembly, and the 5x5x32mm peg, place the trigger/firing pin assembly in the cutout in the grip and align the hole in the trigger with the holes in the upper part of the grip and push the pin through (some sanding will be needed for the trigger to pivot smoothly) (substitute at metal part instead of the plastic printout for best results) 4) take the backplate and grip assembly and join the two using acetone or other adhesives, be sure that the firing pin moves through the center hole freely before permanently bonding the surfaces together, it is important the the top, bottom, and sides of the backplate and grip assembly align properly use a Square ruler to make sure the edges are smooth and aligned properly 5) allow the adhesive to dry/cure for the specified time on its label 6) place the latch (the part with the nub on one end) on the top of the finished grip assembly between the two recesses on top, insert the rails into the two recesses and operate the latch before gluing them down to ensure smooth operation, after the latch is properly sanded glue the rails in place, be sure that no glue gets pushed out of the recesses and onto the latch! 7) allow the adhesive time to dry or cure for the amount of time specified on the label 8) take the finished body assembly and join it to the barrel using the 4x4x32mm pin or a metal equivalent 9) take the almost complete launcher and use adhesive to bond the 20mm rail to the bottom of the barrel, you can place it as far back or as far forward as you want, allow the adhesive to dry afterwards 10) Enjoy your 3-D printed 40mm airsoft grenade launcher! I am not responsible for any injuries caused by improper use of this object, or modified versions of this object, do not attempt to make object this fire live munitions or any other pyrotechnics!, always wear proper safety equipment and only fire at people who give consent to be fired upon. thank you for viewing my creation and making your own!