Thank you. Fix it sticks are expensive and you can't get an exact torque spec for the price. HF for the win.For a very precise, inch-pound tool to do small screws and scope mounts and the like, something like what 55Fairlane posted is the only way to be sure. I've looked at a lot of the consumer grade torque wrenches like the Wheeler and am just not impressed. Fix-it-sticks are well made, but by the time you pay for them you might as well get a legit machinist's tool.
I'll be honest, since almost all the work I do is on my own stuff or free for buddies, my current in-lb wrench is just a cheap harbor-freight job. I couldn't bring myself to pay more for a consumer-grade "gunsmithing" tool that isn't really any better...I'm currently casually watching the used market for deals on a real professional grade tool.
For AR barrel nuts and stuff of that nature, which allows for a broad range of relatively heavy torque, your typical Craftsman mechanic's click-type torque wrench will be fine, or even a cheap beam-type. I use the same wrenches for that stuff that I already had in my toolbox for working on cars.
You're ultimately going to end up with both an inch-pound and foot-pound wrench, as neither will do the other's job.