This is version 2.5 of "The Clothespin Pocket Pistol" Update: Added a new bolt part. Now possible to reload/tension spring from the back. New features: New diameter of barrel (5mm). .177 caliber (4.5mm) ammo will fit. Bolt action system, no more jamming. Easy one movement loading, spring will lock by itself. Built in support, no need for slicer support. Now you can pretty much shoot anything that fits the barrel. Disadvantages: It`s still simple to print but this version features small parts and even more overhang so you might need to look over your printer settings. You need to clean out the support and other obstacles so the bolt can move freely. Smaller ammo (toothpicks) might get stuck. The bolt part might need to be replaced after a while. All credits still goes to: Source: http://www.youtube.com/watch?v=vC2BSb9MZYc Source: http://www.instructables.com/id/How-to-Make-a-Clothespin-Gun/ Also thanks to Jaidyn Edwards for reviewing my design http://www.youtube.com/watch?v=N8kuE_cFl2k This Thing is a work-in-progress and there is room for improvement :D I will add this bolt action system to the v2 with 4mm barrel when i have time. Play safe and don`t shoot in yours or others eyes !!!!!!I printed all parts at the same time. I scaled up the pistol 4% due to ABS shrinking Bolt printed horizontal, no scaling Do notice that one side of bolt is different. End plug printed vertically, no scaling Best is to print 2 of these at the same time so the plastic on each part have time to cool down. 0.20mm layer height 5 shells for strength 15% infill