Pic related for gun. Ruger AR556 is good, but virtually always higher price than the S&W with no benefit except maybe 1 in 8 twist.
Right now PSA's sales give 4 good options
http://palmettostatearmory.com/psa-16-carbine-length-5-56-nato-1-7-phosphate-freedom-rifle-kit.html
(300 USD) The absolute cheapest you will pay for a working rifle, but you need to buy a lower (30-60 at your local FFL), a punch set, and rear sight (also kits don't come with mags). You'll spend around 400 depending on your rear sight and lower cost (and you'll have a very useful punch set). This is the only thing that's not their year-round price.
http://palmettostatearmory.com/psa-16-midlength-5-56-nato-1-7-nitride-moe-ept-rifle-kit-rear-mbus-516444983.html
(360) Nicer furniture and rear sight included. If you're using your raifuru for home defense you'll want at least this because m-lok is so much better for attaching a light to than milspec handguards. Comes to about 430 assembled.
http://palmettostatearmory.com/psa-16-5-56-nato-1-7-mid-length-nitride-13-5-lightweight-keymod-moe-ept-rifle-kit-516447145.html
(420) Freefloat (more accurate, can rest it barriers without effecting aim). Unfortunately it's Keymod (which is like mlok but not quite as good) instead of m-lok, but they rotate sales daily and they frequently have mlok versions for the same price (Ideally you want a nitride barrel and mlok handguard with a QD slingpoint built in, though chrome barrels and now sling point built in works)
http://palmettostatearmory.com/psa-16-mid-length-nitride-moe-ept-freedom-rifle-with-rear-mbus-flat-dark-earth-516446841.html
(460+transfer fee) Pretty comparable to the Ruger and S&W offerings, but with one big advantage: Mid-length gas system! Mid length gas lets you attach a bayonet (carbine length+16 inch has a lug but it's too far back for a bayonet to attach) and drive liberals nuts (It also reduces recoil and parts wear). Comes with a mag.
Another alternative that's currently on sale (and not listed in the guide because that's not normal price) is a brownells prebuilt upper. It's freefloat with keymod and $234 after coupon code MDK (which is 10% off+free ship everything on Brownells).
https://gun.deals/product/brownells-ar-15-complete-upper-receiver-black-keymod-556-30499-after-code-l3v
You need a lower parts kit+lower OR a fully assembled lower. PSA's is on sale for 100+free ship.
http://palmettostatearmory.com/moe-lower-build-kit-black.html
With a lower and punches it will come to ~405 assembled, but does not include sights. Sight sets aren't cheap.
If you have 200 (plus shipping) bucks and don't intend of a different optic, this is worth adding to any of the above
http://palmettostatearmory.com/vortex-sparc-red-dot-scope-ten-magpul-pmag-30-magazines.html
10 good mags (though Magpul's gen 3 are better) and a very solid entry red dot.
Ammo is harder as it depends on what you're looking for. For practice ammo American Eagle is good, reasonably accurate and very reliable. It currently has a rebate going on till the end of the year (Check gun.deals to find good sales on it). Defensive ammo is in the guide (Horrnady is also launching a Critical Defense for rifles early next year. Should be good if they don't blow it.)
As for gear, if you want cheap
https://www.varusteleka.com/en/product/us-lbv-e-woodland-surplus/2792
https://www.varusteleka.com/en/product/us-alice-pistol-belt-surplus/234 (If it won't fit you, don't worry. Plenty of ones from other sources for an ALICE belt in bigger sides)
34+10 flat shipping is pretty good for 6 mags+2 grenades at good quality. You can throw a pair of Alice mag pouches (they're also on Varusteleka, but Amazon and other American sources have them cheaper for 5.50 each) for 3 mags each (12 mags is far more than enough).
And to make it complete
https://www.varusteleka.com/en/product/us-alice-canteen-pouch-surplus/10292 (canteen holders. Get 2)
https://www.varusteleka.com/en/product/finnish-water-bottle-1-l/1710 (canteen. Get 2)
For 73 bucks that's pretty solid. ALICE clips tend to poke you though, which is the main flaw of the system. If you really want to go all the way, throw in an ALICE Pack
https://www.varusteleka.com/en/product/us-alice-medium-pack-with-frame-woodland-surplus/1306
and water bladder (Varusteleka also has these for slightly better than Amazon prices) and you're set to go inawoods (short of stuff put in the backpack).
>>533876
And they both hate you.