FT it makes a great varmit gun. I opted for the 10.5'' barrel and have been very satisfied. Even in the short barrel the velocities are lookin great, like the BLK it seems it still holds performance even in the short offerings. I believe the 18" will tap the full potential and be as long as you would need to go in the AR. The only 90gr I've worked up so far was the Gold Dot pulls I have and I've been pushing them around 2550fps out of the 10.5", I could get more but I like the expansion at this speed and accuracy has been great. The first loaded rounds supplied by JB's is coming very soon and just so happens first up is the 90gr. TNT I believe which has been a great varmit round for the 6.8 shooters. I had a chance to take out a nuisance/predator animal this weekend, 100yd shot and moving, the Gold Dot dropped it right there. Check out my New cal. New build thread to see the 95gr. Barnes results. In the longer barrel it would be absolutely devastating.