Put 100 rounds on it - it does it's job as a BCG. Finish on it is incredibly smooth - very, very smooth. Zero machining marks anywhere. 300BLK is dirty ammo, and it wiped down very easily - easier than some of my NiB coated BCGs.
Re-zero on the 50 yard line, then fired to test that zero at other ranges. Shot it at 25 yards, 15 yards, and 7 yards. for the 50, 25 and 15, held centermass as point of aim. You can see the impact zone - each square is one inch, so it's easy to see the drop and determine the holds at those distances. At 7 yards, I held point of aim at the top of the block, instead of centermass, just in case the drop would have been off the paper. It wasn't, or wouldn't have been. I'd say at any range up to 50 yards, just hold point of aim and you're gonna impact damn close to what you're aiming at, even at 7 yards.
The BCG pic below had 100 rounds of dirty-firing ammo on it, and it was simply wiped down with a dry paper towel. That's it.