Most schools have very strict weapons policies. Verify this project is within bounds for the school. Write them, and they will respond.Īs a student you have a second set of issues.ġ) I assume you are useing a campus machine shop. The advice given on making firearms is very valid. So it would be a good idea to feel that out before you invest to much in this project. One other thing to think about is that many schools have rules against firearms in there buildings, also your department machine shop may not want anything like this being made there.

I would want the firing pin to be completely unable to even touch the cartridge when in safe condition. On the lock work I personally would not want it to be fire-able with out some very positive action on my part. It would be far better to start with a cut off of a barrel. While this is do able it would require a lot of work building a rifling machine. If this will be designed to fallow the rules for a pistol the barrel will need to be rifled. So look up the specs for the material you are using and figure the stresses and apply a reasonable safety factor. Designing a barrel to take pressure is not really any different then a pipe. First off 25,000 kPa is way low, most sources I have seen show the 22 LR at 25,000 psi which would be 172,000 kPa. Save there response so you can show you at least tried to fallow there rules. I can't comment intelligently on the legal issues, other then to agree that a letter to the ATF to get clarification is not a bad idea. What material that can be cut on a small engine lathe would work best, and what is the minimum required material wall thickness. The estimated pressures that I found even though they are only maintained for extremely short intervals where is excess of 25000 KPa. I would want it to as close to an actual pen as possible, but once again I don't want a barrel bursting in my hand either. What is the minimum recommended wall thickness for the barrel. Thanks you in advance.Īh third question I just thought of. I would rather not lose my right to own and use them.

Question two is if I were to make the folding kind similar to a stinger pen what legal ramification follow that process. I have to admit I do like the idea of requiring the pen to pivot in some way to be able to fire, mainly so I can shoot myself when I have a pen in my pocket. My question is what do I have to do to make my own? Do I still pay the tax/register the weapon? Or is it perfectly legal. So if I were to buy one I would have to pay a $5 tax to the NFA. I know that if they can fire while still assuming the straight position of a pen they are considered an AOW (Any other weapon) by the NFA. I am an engineering student and am just beginning to realize the possibilities machines shops open to creative minds.

22 cal pen gun plans