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Posted: 4/28/2011 7:10:45 PM EDT
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Are there any troubleshooting tables for the AR? In other words, when should I consider an extra strength spring rather than a heavier (or lighter) buffer. Of course this depends on the problem (ftf, fte, etc) but I was just wondering if someone has written down some general guidelines for fixing AR problems.
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From troglodyte:
Measure the Action Spring. A rifle length Action Spring should measure between 11 3/4 and 13 1/2 inches and a Carbine length action spring should measure between 10 1/16 and 11 1/4 inches. If the action spring is shorter, replace it immediately. Use a standard USGI spring and avoid "heavier" action springs. H2 buffers may serve you well also. |
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A dynamic system can be modeled as:
m*a+c*v+k*x=f(t) m=mass a=acceleration c=damping coefficient v=velocity k=spring constant x=position from free spring length f(t)= input f(t) and c can be considered constants. change m and/or k, then the acceleration and velocity will change. Bust out some Matlab/Simulink if you really want to get fancy. |
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Quoted: A dynamic system can be modeled as: m*a+c*v+k*x=f(t) m=mass a=acceleration c=damping coefficient v=velocity k=spring constant x=position from free spring length f(t)= input f(t) and c can be considered constants. change m and/or k, then the acceleration and velocity will change. Bust out some Matlab/Simulink if you really want to get fancy.  |
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Quoted:
A dynamic system can be modeled as: m*a+c*v+k*x=f(t) m=mass a=acceleration c=damping coefficient v=velocity k=spring constant x=position from free spring length f(t)= input f(t) and c can be considered constants. change m and/or k, then the acceleration and velocity will change. Bust out some Matlab/Simulink if you really want to get fancy. Isn't f(t) ammo dependent ... which is the root of all evil with regards to AR malfunctions! |
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Quoted: i roll my own. only had about 2000 rounds through my AR, but not one failure of anytime, and brass lands in a nice neat pile. its a constant From calguns.net http://i216.photobucket.com/albums/cc137/addax/ARejectionpattern.jpg Interesting picture. I think I'll save that. |
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Quoted:
Quoted:
i roll my own. only had about 2000 rounds through my AR, but not one failure of anytime, and brass lands in a nice neat pile. its a constant From calguns.net http://i216.photobucket.com/albums/cc137/addax/ARejectionpattern.jpg Interesting picture. I think I'll save that. Yeah it's pretty nice. I usually aim for 4:30 using the weakest ammo I shoot, that way I know it'll be 100% reliable plus I'm minimizing felt recoil. |
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Sprinco/Tactical Springs standard and extra power action springs are great reliability upgrades, especially if you run suppressed.
Sprinco notes that their springs have a much longer life span than standard AR-15 buffer springs, and I believe it! I've got one I bought from Larue Tactical in 2008 that's still going strong despite running with and without a suppressor for around ~15K rounds (hurray reloading!) |
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