Pullpup V.2




Introduction: Pullpup V.2

About: meh... is this textfield necessary?

You've heard about the v.1, right? If not, please go check that out for a little background info. This is my redo, same concept... completely different execution. In this design there isn't a feed ramp, and it's closer to a normal pin gun than a bolt action, but I'm getting far better range (about 15 ft vs rarely making it out of the barrel) and it actually shows off the design by being so much more compact and having the chamber a mere 4 and a half INCHES from the back of the gun. That deserves at least a bit of a nod, right? :p

Anyway, here's my challenge: if anyone can suggest a method (or collectively get me) to get it to fire 30 feet I will make a full ible of how to make that one that fires 30 or more ft and list everyone who helped. sound good? OK. I'm looking forward to the comments starting.... NOW! ;)



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    18 Discussions

    hammer action, shell ejecting, kriss vector on it's way! (ive almost got the mech...anyone able to maybe build a body I could use? I don't have a model and I'm terrible from pictures)

    woot! got it to fire 20 ft, fairly powerful, only 4 #32 bands. will try with more tomorrow and see how it goes

    should I continue with this or try and make the swing bolt one ive been thinking about?

    yeah... I completely overhauled the internals... lot of work

    any ideas for better firing or not yet?

    Not really, I haven't looked at it enough to really see how it works in the first place. I think I do, but not well enough to come up with any great ideas.

    I can't really even find any real friction point, it just doesn't go that far at all... I think maybe the end of the pin isn't impacting the round hard enough or something

    If there is no friction points, then it's your power source. Try reinforcing your trigger mech and put more bands on it.

    the pin seems to be moving fast enough, and extra bands aren't really helping...I think it might be that the pin is contacting and absorbing the shock instead of transfering it

    Ahh, how much tape do you have on the ram, I find that when I put tape past the end of the connector it absorbs a lot of valuable energy. Try adding either a blue spacer or grey spacer. Also make sure the ram barley makes contact with the ammot. It's not the ram pushing the bullets out, it's the energy transfer. The more energy the ram can build up while traveling through your ram guide, the more range you will achieve.

    I have no tape, and it isn't a normal pin gun it has two pins, one on either side of a little rod. that rod is what pulls, instead of pushes, the ammo out

    Can you post a vid, I'd love to help but I need to see the mech in action to help.

    3 replies

    sure I'll do so after my computer finishes downloading the windows 10 preview as my upload speeds right now are abysmal...at best