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After my first build I was doing some more research on various types and lengths and read that the mid-length gas systems are this and that. Since I built a carbine I now need to build a mid-length. Now I just need to figure out how to convince my wife as to why I need/want one. Then I'll have to figure out how to convince her I need/want a rifle length, SBR, AK & .308. So many options and so little funds.

Thanks Ikd.
With that information I just added another AR to my build list. There goes another $700-$1000!

If the gas tube on a AR measures 7.5" from the gas block to the upper reciever does this make it a carbine length?