Originally Posted By: GWHunterEven if I used an adjustable gas block and JP silent buffer system?
Silent buffers really have no bearing on the gas system. As for an adjustable block, you have to have enough gas to begin with. The dwell timing is so very short on a RLG on an 18in barrel, it can be very tricky to get just right. I have built many of them for customers as they are popular with 3 gun shooters. Getting them to run just right is a chore. Don't get me wrong, it can be done, but it isn't that easy. Tuning them for a single ammunition isn't nearly as hard as from some customers that want them to be able to run any junk ammo they throw in there.
Again, while it can be done, and RLG 18in barrels are soft shooting, I would lean towards the mid-length gas system. Most guys can't tell the difference between a mid and an RLG system.