I thought I would wade in on this one. A mid length gas system would not necessarily put you in open class. When we wrote the rules the mid length gas system was quite uncommon, so SMC needs a revamp as we try to be inclusive rather than exclusive. If we apply the advantage rule and say is it an advantage over the best setup gun in the class (Probably a 20' barreled HBAR) then the answer is definitely no it is not so by that rationale it would be fine.
We are seeing a lot more chaps turning up with carbines and an Aussie won with one a few years back and renown SR shooter Gedz is currently harvesting medals like the Jamaican Sprint team whenever he turns up with his carbine. That said the 20 inch offers better velocity which equals less wind drift and the rifle length gas system is softer shooting than either carbine or mid length. So build what you like and remeber is not the gun its the nut behind the butt.
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