It cannot work. There is no buffer tube, buffer and spring. As described there is no process for the trigger on the top gun to be pulled and cause the hammer to strike the fireing pin; unless the top one has been modified to fire from the open bolt. I think if one tried to modify the blot so that the firing pin allways protruded it would be as likely to fire out of battery or missfeed as to actualy fire. In the cycle of opperations of an open bolt gun the fireing pin extends past the bolt face at the completion of the locking phase. But even i this where acomplished in this particular rifle there is no spring to feed, chamber and lock; it’s all unlock extract and eject at witch point the bolt would stay to the rear or bounce forward of the improvised back plate and result in a partial feed. Then the next time the trigger of the bottom rifle was pulled the key would not be engaged onto the gas tube. This gun might fire once from the bottom rifle but thereafter one would need to manualy charge the bottom rifle for every round, resulting in only the bottom rifle fireing.
After thinking about it some more there is no way the top rifle fires from the open bolt because the key on top of the bolt carrier would not be engaged for the bottom rifles gas to cycle the top one. So we are back to having no way fire the top rifle to have a “trigger pull”. However the sear on the top rifle may be modified so that the hammer falles every time the bolt closes. So if that problem has been adressed there is still no recoil buffer on the top or bottom of the pictured rifles. If these where replaced this could actualy work, but as pictured it would not. The text states the bottom rifle has select fire. If these are registered machine guns we are not looking at a fellony so I have no idea why the buffers are not in place. The most likely answer is that the makers of this contraption never intended to fire it at all.
Those black cylindrical things attaching to the butt plate are the buffer tubes. There’s no reason for them to be that big around otherwise. The top one, operating in full-auto with the trigger fixed down, would eject, load, and fire when it got the gas from the bottom one, but not cycle again until it got gas from the bottom one again. Pretty expensive and cumbersome way to fire two shots. I think I’ll just double-tap.
My money is on it working. You would have to modify the upper unit’s trigger mechanism to, like an M16 on full auto, release the hammer after the blot is locked in place. Legal? I dunno.
My question is: how do you aim this darn thing?
Cool idea though: having the gas tubes criss-crossed. The creativity of folks never ceases to amaze.
Sure it could work. And yeah; no provision for sights is apparent. Let’s see now; I suppose you could string together a half dozen or so of those if you had enough gas tube and a lot of time to waste.
November 30th, 2010 at 10:25 am
Tony Rumore is well-known in the title II world. You can see the Siamese 223 here: http://www.tromix.com/Projects_o_Tromix.htm
No video, but if Tony says it works, it works.
November 30th, 2010 at 1:27 pm
It cannot work. There is no buffer tube, buffer and spring. As described there is no process for the trigger on the top gun to be pulled and cause the hammer to strike the fireing pin; unless the top one has been modified to fire from the open bolt. I think if one tried to modify the blot so that the firing pin allways protruded it would be as likely to fire out of battery or missfeed as to actualy fire. In the cycle of opperations of an open bolt gun the fireing pin extends past the bolt face at the completion of the locking phase. But even i this where acomplished in this particular rifle there is no spring to feed, chamber and lock; it’s all unlock extract and eject at witch point the bolt would stay to the rear or bounce forward of the improvised back plate and result in a partial feed. Then the next time the trigger of the bottom rifle was pulled the key would not be engaged onto the gas tube. This gun might fire once from the bottom rifle but thereafter one would need to manualy charge the bottom rifle for every round, resulting in only the bottom rifle fireing.
November 30th, 2010 at 1:56 pm
After thinking about it some more there is no way the top rifle fires from the open bolt because the key on top of the bolt carrier would not be engaged for the bottom rifles gas to cycle the top one. So we are back to having no way fire the top rifle to have a “trigger pull”. However the sear on the top rifle may be modified so that the hammer falles every time the bolt closes. So if that problem has been adressed there is still no recoil buffer on the top or bottom of the pictured rifles. If these where replaced this could actualy work, but as pictured it would not. The text states the bottom rifle has select fire. If these are registered machine guns we are not looking at a fellony so I have no idea why the buffers are not in place. The most likely answer is that the makers of this contraption never intended to fire it at all.
November 30th, 2010 at 2:11 pm
Those black cylindrical things attaching to the butt plate are the buffer tubes. There’s no reason for them to be that big around otherwise. The top one, operating in full-auto with the trigger fixed down, would eject, load, and fire when it got the gas from the bottom one, but not cycle again until it got gas from the bottom one again. Pretty expensive and cumbersome way to fire two shots. I think I’ll just double-tap.
November 30th, 2010 at 3:13 pm
My money is on it working. You would have to modify the upper unit’s trigger mechanism to, like an M16 on full auto, release the hammer after the blot is locked in place. Legal? I dunno.
My question is: how do you aim this darn thing?
Cool idea though: having the gas tubes criss-crossed. The creativity of folks never ceases to amaze.
November 30th, 2010 at 6:58 pm
Sure it could work. And yeah; no provision for sights is apparent. Let’s see now; I suppose you could string together a half dozen or so of those if you had enough gas tube and a lot of time to waste.
November 30th, 2010 at 10:05 pm
And it’s auto-loading single-shot, right? Thus street legal.
December 1st, 2010 at 12:33 am
It’s like the german Gast Gun
http://en.wikipedia.org/wiki/Gast_Gun
December 1st, 2010 at 7:56 pm
Those gas port tubes look all wrong. Unless the two guns fire exactly at the same instant one might unlock before it’s bullet has left the barrel.