Both the old and new style rem triggers are adjustable. Just google Remington 700 trigger adjustment and it'll show you. If you have a new X-mark trigger, google Remington X-mark trigger adjustment. I person hate the X-mark and prefer the old style Rem trigger over it.
There are many different aftermarket triggers for the Rem's, most common, Jewell, Rifle Basix, and Timney. I run a lot of Jewells and think highly of them on my LR rigs.