The best way to do that is to actually read their little bio, assuming they put one in there, and look for typical indicators for that kind of alignment: talking about guns/shooting ranges, pictures of them at the shooting range, pictures of them with a dead deer, etc. Finally, if that fails, try just asking them when you have a match and start chatting.

I like the idea of being able to filter people too, and I find I can tell a lot about people from their OKC profile. The problem, however, is that OKC is basically a big waste of time because everyone desirable has moved to Tinder, and the few decent women on OKC don't respond because they get too many messages, and I end up spending way too much time writing messages with zero return. With Tinder, I don't have to waste my precious time 1) reading through a profile to see if this is someone I should spend time writing, and 2) writing a long, thoughtful message, only to get no response. If a woman matches me on Tinder, there's a decent chance she's actually going to respond. It's probably something like 33% chance I'll get a response on Tinder to a match. On OKC, it's probably less than 1%. If that means I have to spend a little more time text-chatting to learn about them because the Tinder profiles are so sparse, that's still a giant time savings for me.