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Some thing like this:Solar wrote:I have heard that it is illegal to place a spring loaded firing pin behind 40mm tubing in the U.S. . M203 airsoft clones get around this by using a levered pin that dislodges a springed mechanism inside the pre-charged cartridge.
It specifies firearms, no mention of air-powered weapons.NFA weapons are: machine guns, sound suppressors (a.k.a.
silencers), short barreled shotguns, short barreled rifles,
destructive devices and "any other weapons". Exactly what these
weapons are is defined in the law, as well as in court cases
interpreting the law. Withut going into to much detail, these are
what the categories encompass:
A machine gun is any gun that can fire more than one shot with
a single pull of the trigger, or a receiver of a machine gun, or a
combination of parts for assembling a machine gun, or a part or set
of parts for converting a gun into a machine gun.
A silencer is any device for muffling the gunshot of a portable
firearm, or any part or parts exclusively designed or intended for
such a device (see discussion below).
A short barreled shotgun is any shotgun (which is defined as a
shoulder fired, smooth bore firearm) with a barrel of less than 18"
or an overall length of less than 26", or any weapon made from a
shotgun falling into the same length parameters.
A short barreled rifle is a rifle (which is defined as a shoulder
fired, rifled bore firearm) with a barrel length of less than 16",
or an overall length of less than 26", or any weapon made from a
rifle falling into the same length parameters (like a pistol made
from a rifle). In measuring barrel length you do it from the
closed breech to the muzzle, see 27 CFR sec. 179.11. To measure
overall length do so along, "the distance between the extreme ends
of the weapon measured along a line parallel to the center line of
the bore." 27 CFR sec. 179.11. On a folding stock weapon you
measure with the stock extended, provided the stock is not readily
detachable, and the weapon is meant to be fired from the shoulder.
A destructive device (DD) can be two basic categories of things.
It can be an explosive, incendiary or poison gas weapon, like a
bomb or grenade. It can also be a firearm with a bore over 1/2",
with exceptions for sporting shotguns, among other things (see
discussion below). I call the second category large bore
destructive devices. As a general rule only this second category
is commercially available.
Any other weapons (AOW's) are a number of things; smooth bore
pistols, any pistol with more than one grip, (but see below) gadget
type guns (cane gun, pen gun) and shoulder fired weapons with both
rifled and smooth bore barrels between 12" and 18", that must be
manually reloaded (see discussion below).
The only one I can think of is this one.Suppressive Fire wrote:There was a thread on spudtech that quoted actual legislation I just wish I could find the stupid thing in the archive.
That is more or less how the Brocock Tandem Air Cartridge works, but as A-98 pointed out, given the lower pressures and larger calibres we're working with here, a piston design would be more efficient.us sniper wrote:What about this design for your cartridge. To fill you push the push and fill the chamber with air. To get more power you just change the gas inside the cartridge.
http://i153.photobucket.com/albums/s240 ... tridge.jpg
The idea is to do a basic check for performance by duct-taping the prototype cartridge to a barrel and seeing what sort of velocity I get, If it will put a parble through 1/4" thick plywood I'll be a happy bunny. If that works well, I'll cast a proper breech and see what sort of blowback energy is available and move from there.FreakyShotGlass wrote:For a prototype why don't you try and use the trigger mechanism from a cap gun. Would save time designing a trigger mech yourself (they can be really annoying to get right).
