APS M870 Shell Toolkit

thingiverse

Update 22May2021: Cap and Wad updated for superior reliability. Extenders and Choke added. Notes about each part: 1.) Cap - RESIN PRINT - Should work for most APS shells. You may need to print at 99% or 101% depending on your shell tolerances. Should shatter as it leaves the barrel and press fit in most APS shells 2.) Wad - RESIN OR FDM - Works as intended. You don't "need" these but they help get you some solid fps. Guaranteed not to Squib. 3.) Shell Valve Tool - FDM - Use two m2x10mm bolts and thread them in. This helps remove the caps off the back if you ever need to swap out o-rings. Very useful to not cut your hands! 4a + 4b.) +1 and +2 shell cap extenders - FDM OR RESIN - Make sure to use a longer spring 5.) 18mm Choke - FDM OR RESIN - best used with paintballs. 6.) Shell Oring - *BE VERY CAREFUL WITH THIS ONE. DANGER AND CAUTION, YOU CAN DAMAGE BOTH YOURSELF AND YOUR GEAR IF YOU DO THIS IN AN UNSAFE WAY. DO NOT PRINT THIS OUT OF ANY RIGID OR HARD MATERIAL* Print the Oring out of 95a TPU or softer, and make sure to apply safe lubrication (silicone oil is usually TPU safe). It should be a drop-in replacement but slightly stiff at first. It will wear in over time. I recommend testing with propane first just to make sure your dimensions are correct and you're holding a good seal. Also safer than co2 or higher than 800PSI.