My first was a target model, it now has a 17" Majestic aluminum bull barrel, a Promag Archangel stock and a 6x24 scope. This is the one we shoot pingpong balls off of golf tees at 350 feet.
The next one has a Dragunov style stock, a 6x24 scope and a Beyer custom 1:20 twist fluted and threaded aluminum bull barrel. This one was built to experiment with the smaller hypervelocity stuff and has been out well over 150 yards.
The last one is a stainless carbine with a BlackHawk Axiom stock and a 3x9 scope. This is my favorite walk in the woods rifle, it comes in at just over 5 pounds.
Haven't tried the BX25 yet, I run factory 10 rounders and Butler Creek steel lipped 25s. I use the clear ones because I like to know what I have left (my major gripe with the BX25 is you can't see it) and have been pretty happy with them. They feed well, but after thousands of rounds (I mean well lover 10,000) the plastic will stress fracture and they will cause feed problems. When they do just throw them out and replace them, they're only about $25- $30.