Soviet TKB-22PM
If ever there was a design that needed resurrection, this is it.
http://world.guns.ru/assault/as94-e.htm also http://www.abovetopsecret.com/forum/thread371591/pg1
The second link gives an indication of possible operation, but the ejection is wrong, as it ejects like the RFB and FS2000, thru a tube above the barrel. And I believe the dimensions for the barrel in the first link to be incorrect, due to the shape of the housing above the barrel where the spent casing would start it's path up and forward is farther forward than the listed barrel length would allow.
Still, it is amazingly space efficient, and if the extraction/ejection could be moved to within 4" of the buttplate (as the difference between the barrel length and overall length in the first link suggest), this would be an amazing weapon. If it could incorporate a swappable barrel to allow mission specificity (MOUT vs mountain/open terrain), and chambered in either 6.8 SPC or 6.5 Grendel, it would be a solution to the current inadequacy of the M4.
http://world.guns.ru/assault/as94-e.htm also http://www.abovetopsecret.com/forum/thread371591/pg1
The second link gives an indication of possible operation, but the ejection is wrong, as it ejects like the RFB and FS2000, thru a tube above the barrel. And I believe the dimensions for the barrel in the first link to be incorrect, due to the shape of the housing above the barrel where the spent casing would start it's path up and forward is farther forward than the listed barrel length would allow.
Still, it is amazingly space efficient, and if the extraction/ejection could be moved to within 4" of the buttplate (as the difference between the barrel length and overall length in the first link suggest), this would be an amazing weapon. If it could incorporate a swappable barrel to allow mission specificity (MOUT vs mountain/open terrain), and chambered in either 6.8 SPC or 6.5 Grendel, it would be a solution to the current inadequacy of the M4.
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Replies to This Discussion
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Permalink Reply by Arne Boberg on -
The second link you provided shows the barrel starting about half-way in the middle of the gun. This doesn't jibe with what was said in the first link about "full length" barrel.
Our Boberg XR feeding mechanism would offer a barrel about 4" longer than what I see in this Russian design - if I have interpreted it correctly.
Replacing the M4 would be a great project to pursue.
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Permalink Reply by BretShooter on -
Arne Boberg said:The second link you provided shows the barrel starting about half-way in the middle of the gun. This doesn't jibe with what was said in the first link about "full length" barrel.
Our Boberg XR feeding mechanism would offer a barrel about 4" longer than what I see in this Russian design - if I have interpreted it correctly.
Replacing the M4 would be a great project to pursue.
Yes, the specs say the barrel comes up 4" short of the buttplate, vs where it shows in the graphic. And from where the humpback in the stock is for the feed tube, I agree with you.
Since your design needs some room behind the mag for the tongs, I guess the mag would move forward, but as you say, the barrel would also move rearward. Since it probably wouldn't have a rotating barrel (for ultimate accuracy concerns) like your pistol, the barrel would sit permanently over the mag, and the tongs extract rounds from under it. But as you know, the key to overall compactness is how close to the rear can one get the chamber. If you could design a rifle with a similar system to your pistol, the action should only be longer than your pistols due to the need to handle longer rounds. If you could add either a over the barrel ejection tube, or some way to have the ejection port swap sides easily and preferable without extra "lefty" parts, you would have a winner.
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Permalink Reply by Arne Boberg on
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You are right - the cartridge length (plus about 0.60") pretty much determines the non-barrel length of the XR feeding mechanism. A bulpup rifle would probably have the springs on the side with the bolt straddling the round. Top ejection is a possiblility - it would shave off about .3", so the non-barrel length would then be the cartridge length plus 0.30". So non-barrel length for the 6.5 Grendel rifle would be 2.56". So a 16" barreled gun would be about 18.5" long.
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Permalink Reply by Arne Boberg on
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Now I have to find time to design it...
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Permalink Reply by James on -
Are you bouncing that idea around?
Arne Boberg said:The second link you provided shows the barrel starting about half-way in the middle of the gun. This doesn't jibe with what was said in the first link about "full length" barrel.
Our Boberg XR feeding mechanism would offer a barrel about 4" longer than what I see in this Russian design - if I have interpreted it correctly.
Replacing the M4 would be a great project to pursue.
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Permalink Reply by Arne Boberg on
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I have personally been bouncing it around, but until we get fully up and running, a rifle design will have to wait.
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