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Posted: 11/19/2010 10:58:41 AM EDT
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Designed this while I was working on my mechanical engineering degree at Western Michigan Univeristy. Spent a year perfecting it. DPMS sponsored the project, but has since just ignored us. So now I have the prototype in my possesion that I'm trying to handoff to another AR manufacture. Photobucket isnt working so here's the link on DPMS' forum for the pictures and more information
Gas-Piston Prototype |
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varying gas pressure is something to deal with down the line. The goal of the project was to lower the overall operating temperatures of the rifle and to eliminate "cook off" rounds, which we did some through proof of the thermal images.
Unlike other aftermarket gas blocks that use a clamp force of 4 bolts, this one uses the pre-existing holes from the original gas block, but without tapered pins. So removal of the block just takes a push pin and a couple taps of a hammer. After that, the push rod comes right out. The spring puts a load resistance at the midpoint of the pushrod, preventing "buckling" in the middle. It's a very low spring rate, around 1 lb per inch. Thanks for the questions! |
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Ryan,
You have a great project and a fun one too. I wish my senior project just like yours. I'm big in R&D. Have you looking into pressure shock wave from load of expel round? This action, connection roll-pin between A-frame front sight to break. Have you looking into re-engineer it, bolt carrier that prevent carrier-tilt? Keep up the good work. Hoang |
| The front sight/gas block actually is used as the "stopper" for the rebound of the push rod. The gas tube comes within about .25 inches of contact with the push rod, so they never actually come into contact. Anyone can do a project like this as long as you have some engineering/design/machining skills, but I made sure to get permission from the school, my professor and our local police department before going through with it. |
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