This place is legit. I've been looking for a good indoor range and Blackstone fits the bill perfectly.
The store is pretty easy to access, right off 277. I'm not sure when the building was erected but it looks brand new on the outside. Everything on the inside is neatly organized and looks great. Super to easy to find anything I needed.
After signing a waiver, I watched a quick 8-ish minute video on range safety and then went to the back register. Since I had my own firearm, ammo, eyes, and ears, I just needed to pay for targets and I purchased an hour on the range. It was $25 for me, and then $15 for a friend of mine to join. Pretty decent rates.
The bays themselves are in good shape. There were 3 separate ranges and it looked like there were probably 10 bays in each. They had a safety officer in the room we were all shooting who was helpful with getting the targets out in the range and bringing them back.
Overall, I had a great time here and I will most certainly be back in the near future.