I've got 5 mid-length guns: 3 KAC SR-15 (two 16" and a 14.5"), a BCM 14.5" and a Noveske 16". I've never had a gas issue with any of them, but I shoot only XM193, M855 or Hornady match .223. The SR-15 gas system is more like the Noveske "intermediate" system, in that it is longer than the mid-length of BCM, Noveske or DD, but shorter than rifle-length.
I run the Noveske with an A2 stock/buffer and the BCM with an H buffer. Interestingly, the 16" SR15 comes from the factory with a carbine buffer, but the 14.5" SR15 comes with an H2 buffer.
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest. - Confucius
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