Quote: taztheblade they are also against NFA rules so they would be jail time to make, possess, buy or use.
this is what would be classed as a zip gun.
it would more than likely be dangerous to fire as well.
my advice is stay away from if you want to keep your freedom, all your body parts where they are, and dont want to end up bubba's "wife" in the big house.
From what I understand, a "zip gun" is illegal because it is a smooth bore pistol/rifle. Pistols and rifles must have rifling to be legal. Since it is a shotgun, and if it meets barrel and overall length requirements, then it should be good to go.
Joined: March 05 2005 Posts: 55
Posted: August 09 2009 at 2:42am | IP Logged
this is from the BATF website
(A6) Does the GCA prohibit anyone from making a handgun, shotgun or rifle? [Back]
With certain exceptions a firearm may be made by a non-licensee provided it is not for sale and the maker is not prohibited from possessing firearms. However, a person is prohibited from assembling a non-sporting semi-automatic rifle or non-sporting shotgun from imported parts. In addition, the making of an NFA firearm requires a tax payment and approval by ATF. An application to make a machine gun will not be approved unless documentation is submitted showing that the firearm is being made for a Federal or State agency.
[18 U.S.C. 922(o) and (r), 26 U.S.C. 5822, 27 CFR 478.39, 479.62 and 479.105]
Joined: August 28 2009 Posts: 28
Posted: October 14 2009 at 10:12am | IP Logged
I think the shell expanding in the chamber may help keep the pressure from pushing the barrel out the front. (Add to that the inertia from the barrel coming back and arm mussels, I'd think it's similar to a blow back design.)
Joined: January 04 2008 Location: United States Posts: 1352
Posted: October 14 2009 at 2:48pm | IP Logged
The technical term for this is known as the "Blow Forward" operating system. A few gun designers played around with this around the early 1900's, but it had proven to be mostly unreliable.
There WAS one semi-automatic handgun that DID prove to function acceptably utilizing this method of operation, but due to a variety of reasons it was dropped and this operating system was rarely experimented with since.
Joined: August 28 2009 Posts: 28
Posted: November 06 2009 at 10:28am | IP Logged
I'm familiar with the blow forward system.
What I meant is that the inertia from the barrel and arm weight coming back plus the arm strength (as a spring) keeps the barrel from moving forward until pressure has dropped, like in an advanced ignition open bolt firearm.
There's a lot of discussion on this topic in the link I provided above.
Joined: September 09 2009 Posts: 10
Posted: May 03 2011 at 12:40am | IP Logged
A good video of one in action, showing how it works. Definitely nothing more than a novelty or emergency guerrilla combat arm ('get another gun' concept like the liberator).
The only questionable legality issue is whether it would be considered a rifle or pistol. If it is decided to be a pistol, due to lack of contact with the shoulder, it would be an AOW.
The supposed spec pressures match up pretty well with the pipe being a few hundred PSI over 12ga 2-3/4", which plus the fact the the 'barrel' is well overbore (around .81", iirc) and the dual layer of pipe around the 'chamber' area, means they should be "safe" to make from common 3/4" galvanized plumbing pipe like
you can get in any hardware store.
I think the fact that they can be safely fired at all is very telling about the blow-forward principle, and how little forward push there actually is on the barrel. Every time one of these is fired is a bit like OrionsHammer's flying bolt experiment, but for the blowforward instead of blowback principle, and i haven't read of the barrel ever flying away, yet.
Joined: January 04 2010 Posts: 393
Posted: May 03 2011 at 12:51pm | IP Logged
Good ol' website
Also, there is one in very good mexican gang movie "Sin Nombre"
Joined: March 13 2015 Location: Philippines Posts: 7
Posted: March 14 2015 at 12:02am | IP Logged
Living in the philippines, i really know this gun.
The slam-bang now has 2 types: the old paliuntod and the more common sumpak.
the paliuntod, much like the Guerrilla Gun, has a stationary receiver with the loaded barrel slammed on the fixed pin.
the sumpak is the complete opposite, with a moveable tube (with firing pin) slammed into the stationary barrel.
Joined: July 16 2013 Posts: 944
Posted: March 15 2015 at 6:07am | IP Logged
Richardson Industries made the slamfiree Guerilla gun for the Phillipines.
Iraqveteran8888 channel on youtube have a video of one being used with all manner of different shells, and explains the mechanics of the thing quite nicely.
Joined: February 26 2013 Location: United States Posts: 4292
Posted: March 15 2015 at 10:45pm | IP Logged
The National Firearms Museum has one, apparently from the 2nd WW - just a stock w/ a hole in it, with a nail for a firing pin, and a barrel made of a couple of pieces of pipe, chamfered for the rim. I don't know if it's on display, but I doubt they've gotten rid of it.
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