i looked at the ruger, and i dont see how their gas system does anything different than any regulated piston system.. however, i can see what they did with their carrier, they added skis to the back end so that the carrier would fit tighter in the receiver and not have the opportunity to rock... i think if anything with the ruger, this is what does the trick for their design...
has anyone seen this solution?...
http://www.youtube.com/watch?v=zzsE_...eature=related
it looks like that would do the same as the SR-556s carrier but has a surface thats not going to damage anything
for the buffer assembly.. i have an idea for takedown.. what if you had a secondary retaining piece in the buffer tube, rack the carrier back and push a button or move a lever to lock the buffer tube further back in the buffer for normal breakdown
but i kind of like the blackriflearms solution, what do you think?