That’s how I feel with the x39. I can buy very good ammo for the blk. Factory very accurate and lots of different Bullets. It gives up speed but I also don’t need to change anything but the barrel. For me that’s the winning factor in the round. If I was gonna go with something I had to change a bunch of parts and run different mags I would shoot a .458 socom. Both need to be reloaded to get good performance and require swapping of parts. I think a lot comes down to your AR stuff vs none AR. The blk juts makes it easy to use that platform. It just come down to what you prefer. I have found that I have been able to get very good performance out of the blk using the light 100-125 gr Bullets. I’m running the 100gr raptors at 2550fps. I think the x39 really has the advantage when 125 plug gr is used. Just not enough case in the blk.