Well, I got tired of waiting for TROY to send me a block and purchased a PRI. Fits perfect. Having the gas block not rubbing on the rail adapter made a nice difference in shooting. Here's a grouping from 200 yards standing with bipod resting on an ATV's cargo box (not very stable). The first shot was low left and I compensated for the rest of the group. It was also variable winds. the square boxes are 1" X 1".
Unfortunately I have to sell the rifle. Look for it in the Yard Sale section.