So we all know that the optimum gas system for a 16" barreled AR is the mid-length system. We also know that the mid-length system is still fairly new and that most of the 16" barrels out there are still ported at carbine length. To treat this increase in pressure and dwell time there are heavier buffers and springs available. There are also "D-Fender" type extractor upgrades to handle the more violent reaction. So. . . what is your remedy for a carbine length 16" barrel??? H2 or H3 buffers? Heavier springs? Is there something I missed? The reason I ask is because I just obtained a barrel of this nature and it may be put into circulation rather than placed upon a "For Sale" rifle, as I originally thought.