1) To be honest i would say go local.. I buy all my stuff in AZ from one of the top tier builders he is Arizona armory. All billet uppers and lowers, custom engraving and i personally think the billet is worth the expense..Also if you go local they can build the gun to your specs and you can save money.. why buy a gun that you are going to toss half the parts into the garbage so to speak and put a maid or moe grip on replace the butt stock, add a hand rail etc.
If you had to go with name brand i would go with Larue, Or BMC, Spikes, noveske.. Done. Best bang for the buck will be Spikes or BCM on Sale. Larue well there is nothing better IMHO
2) I could not make up my mind so i ended up with 5 Ar's one for every thing i wanted to do... 22 ar, SBR, SPR, LW, and my version of a kiss AR "had spare parts so i built another gun lol"
3) my SPR will hit 200 yd easy. 18 in Fluted luthor walthar barrel, FF hand rail, Chrome BCG, timney 3lb single stage trigger, billet upper and lower etc.
4) not at all i support Local first then named brand. with that said i would only purchase from BCM, spikes and larue. Even though everyone says milspec don't get entirely hung up on it. Sure its important but there are plenty of AR's that are not mil spec and shoot well..
5) It can be but you have over penetration. As far as home protection goes nothing does better then a good old pump.. Racking the slide once will scare 99.9 percent of the people that hear it and the .1 percent that don't a slug will take care of that.
Ar's are like the rice burners of the Gun world.. There are many options and you need to do your homework to figure out what you want..
if i had to do my first rifle again i would get this configuration.
Billet upper
billet lower
geissele SSA trigger
14.5 in 1x7 Chrome lined barrel with pinned flash hider
mid length gas system
FF hand rail "YHM is good gear for the value"
Chome BCG "Young MFG national match" "easy clean up"
Ctr Stock
Front and rear flip up sights "YHM is good value Troy is best"
Magpul ASAP
Magpul RSA
Red DOT "Primary arms is a good value"
With that said with AZ being a Sate that "allows SBR's" i would only have the following 3 rifle configurations if i had to do it all over again.
10.5 in SBR
18 in SPR
S&W 15-22
with all ofthe goodies, FF hand rails, Chome BCG's. high end triggers, all magpulled up etc..
here is a good site to go over AR's in general
So you want to buy an AR-15, huh?
Here are some pics "some are older and have changed configs a little"
My one gun is still waiting for my 10.5 in barrel but you get the idea..
Many options just here is a few to give you an idea.
Family photo minus my kiss AR
My first AR " this is getting the 10.5 in barrel and upper, lower, buffer tube and FF handrail is getting done in OD green
My kiss AR
Spr Upper
SPR Complete
A LW Chrome BCG from young Manufacturing
My SHTF Engraved lower
My Zombies Lower