Many people try to blame accuracy on so many parts, but in reality, unless your talking about bench rest accuracy , there are only few fundamentals.
The absolute most important thing is a good quality barrel. After that is the ammo you feed it. That's it. Everything else is over complicating the issue or masking marksmanship issues. A good trigger will quite often help the shooter achieve smaller groups, however that's because his trigger pull is bad. You can have a 10lb trigger and if your form is perfect, you won't shoot any less accurate then a 1lb trigger.
So slap a good barrel on your rifle, work up a good load or buy some match ammo and spend the rest of your time and money practicing your marksmanship.