I need to know the most cost-effective method of building the

Best for what...? Shop around and be patient and buy good quality components when they're on sale, I guess.

>>33802393
PSA would be a good choice for uppers, but once you factor in the fraudulent charges from your credit card being stolen, you might as well have gone somewhere else.

>>33802400
Sorry for not clarifying. I'd like to build one for recreational shooting and perhaps long distance marksmanship

>>33802393

Buy one already built.

Unless you know you want special parts, companies like SAW, Ruger, etc are falling below 500 pretty commonly.

>>33802414
In that case I suggest an SPR build. Get a good 18" barrel with rifle gas from White Oak Armament and a free float tube to go over it. Buy the best aftermarket trigger and bolt carrier group you can afford. Invest in some good glass -- your best bet is a 3x9 Burris from Opticsplanet.com. Last I looked they were still under $200.

The rest is up to you. For practical instruction, I found the AR-15 assembly videos at Midwayusa without equal.

>>33802393
I have the same question as OP, but in .300 blkout??

>>33802400
You're such an attention whore, lol eat it up.

>>33802414
by long distance do you mean you want to push .223 to its limits (and your own skill i suppose) for hitting paper targets without time/score pressure, or, you want to go to a match and compete but weren't being particular about cartridge? just checking because you may not even want an AR at all for matches if you care about doing really well.

>>33803155
Not that guy, but what would you get instead?

>>33803508
Sig 716

>>33802466
Not OP but am equally lost with building an ar. That seems like sound advice, but what else should I watch out for when building a rifle? What yields actual $$ : performance ratio and what is just gimmicky or a waste of money?

>>33802414
>perhaps long distance marksmanship
There are other guns suited better for that.