So I have an AR-10 (DPMS) and now an AR15. I definitely want a nice trigger for the 10 as it's a long range shooter, 24" bull barrel. The trigger is awful on it. I'd also like a better one on my 15. When I look up triggers there are as many options as there are guns or optics. I don't know anything about any of them and the different types of options that come for them. So I'd appreciate some guidance, especially if they're just "drop in" or if I'd have to have someone install them.