Houston has a special fondness for its firearms. That's obvious from the sheer number and variety of outlets, from Carter's Country -- that Wal-Mart of weaponry -- to other high-profile retailers. Top Gun takes a different, specialized tact. Just like most golfers know they shouldn't buy clubs until they test them out, Top Gun realizes that live-fire is the only sure way for a shooter to know that this gun's just right. Tucked away in a small building a block south of Richmond, Top Gun has one of the rare indoor (and air-conditioned) shooting ranges. The state-of-the-art 15-lane facility can be used to test-fire potential purchases. And there are special bargains for those who want to buy the rental weapons. There isn't a huge on-site inventory, but the veteran staff can help novices find the best-suited guns for them, and soon have 'em ready. And with the upscale range awaiting, you can be assured of always hitting the mark on purchases. Top Gun's approach is right on target.