That would be great if you don't mind... I'm building a 6.8SPC. I'm still considering the 6.5G per Grand's info, but for now I'm moving toward the 6.8SPC. Any thoughts would be appreciated...
OK, here you go. Grand may disagree and he if does, go with what he says. He's forgotten more since yesterday than my total knowledge on the subject.
Stripped Upper and lower. I am one to believe what you put into these are more important than the parts themselves. You can spend a bunch on these in billet and custom machinings and such. As I've said, I've used several of the Anderson stripped lowers and uppers. They are mil spec and AR not fancy but do the trick. I've paid as little as $39 and as much as $50 for the lower.
Lower parts kit. This has your mag release parts, safety parts, bolt release parts, buffer tube retention parts, assembly pins parts. You can get a lower parts kit that has it all but since you want an upgraded trigger you can find them without the trigger group. Same with the grip, you'll probably want something better than the mil spec grip. You can also source each part but that's a pain for me .
Trigger. Hundreds of options available. Grand turned me onto the Giesllee (sp?) SSA. It is a two stage trigger and I love it.
Buffer tube, buffer and spring. You can source this as a group or individually. You can even find them with the stock. I usually purchase the tube, buffer and spring as kit, mil spec, for simplicity. You'll also need the plate that goes on buffer tube.
Your upper parts can be purchased separately or as a kit. For simplicity, I usually order the forward assist and the dust cover as a kit.
Charging handle. You can spend as little as $10 for a no name mil spec to close to $100 for something fancy. This can easily upgraded later if you don't like what you get. You can go mil spec initially and upgrade when you find something you really like.
BCG. According to Grand, the only difference in the 556 and 6.8 is the actual bolt. That means you can purchase a 556 bcg and simply change out the bolt. I've seen 6.8 bcgs available if you want to just not fool with changing it out. I built a long range 556 found a nice NiBo BCG.
Barrel. Grand can help you here more than I. If you are as concerned about accuracy as you've stated, Grand can offer suggestions as to who makes the best match grade barrels. I bought a sweet stainless, spiral fluted barrel from ground zero precision that I've been pleased with.
Gas block and tube. If you go with a free float rail you'll want a low profile gas block. Nothing special here. If you go stainless on your barrel you may want to go with stainless on the gas block. As to the tube, nothing special here. Just make sure you get the correct length to match your barrel. They are usually in three lengths, pistol, carbine, or rifle. Almost forgot, you need a flash hider.
Rails. You can spend several hundred on just the rails. I've gotten a bunch of rails from Monstrum and have been pleased. You can get them in different colors. You can get the standard quad rails or you can get the "key mod" style. This allows you to have the picatiny rails just where you want/need them. The rails usually come with a barrel nut that matches the rail.
Tools. I recommend the AR bench block set. A bench vise for the above. It makes assembly much easier. You'll also need a AR tool, a torque wrench, a small ball pien hammer, a small plastic hammer, a set of roll pin punch sets, various Allen head drivers (I like the T handle style) and some screw drivers. Another tool that I got later but makes the roll pin install so much easier is a roll pin starter punch set.
You'll also need some assembly lube which is a Molly grease.
Have a tablet or a PC handy to watch YouTube videos on assembly.