You're looking for what caliber? And are you looking for accurate or just good enough?
Furniture on your rifle - if this is a firearm that is going to get tossed around, then you might want to think about a free float tube - it shrouds the barrel but doesn't make contact with it. It gets hit or dropped, it has no effect on the barrels accuracy. If that's not important, any kind of handguard is acceptable. With either of these you want your front site post on your barrel - not on your handguard.
You sold on Eotech? What kind of range are you looking at? 100, 200, 300? Do you need NVG compatibility (I don't know, do you hog hunt?) Have you used HW sights before? If no, go look at them if you can - they can be an acquired taste. It really comes down to what you're shooting - when you talk about a work rifle, I'm assuming you're using it for game?
Are you going to build or buy?
ANY upper and lower receiver manufacturer will do, seriously. Rock River Arms, DPMS, Palmetto State, Surplus Arms and Ammo, Midway, Cheaper than Dirt. You don't have to spend a bunch of money on a BCM, VLTOR or any of those - do a google search and buy what you want.
Do you want a single stage mil spec trigger? If yes, then get a lower parts kit from any supplier on line (be aware the trigger adds an addl 11% use tax) just bargain hunt. You can spend a little or a whol elot on these depending on what you like. I don't run competitions - I use my primary AR to hunt and use a 2 stage trigger that is nice, but pricey.
Stock and pistol grip - you seem to like Magpul - go for it.
You'll need a gas block, charging handle,complete bolt carrier group (doesn't matter who you get this from, shop around) and bolt ( you want this to match your barrel though), gas tube (find out what length your gas system is - shoot for mid length as it's smoother than carbine), and probably a flash hider vice a compensator - the AR has virtually no kick to it.
Magazines - you can buy the PMAGs, but if it's a work gun, then you probably can't hunt with 20+ rounds, so look for smaller magazines. There is an excellent tutorial on building an AR15 on arfcom
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