Okay so Ive been bitten by the rifle bug and decide I want to venture further out than just my handguns. I would like to build/assemble my own AR with a few stipulations and need some help on a variety of questions. I LIVE IN NEW JERSEY , just to point that out because that will be the biggest obstacle. The gun will be used for target practice, around 300 yards would be the max, with the possibility of further. I am also on a budget of hopefully less than $1000. So with that in mind here goes. Okay, so I don't know much about rifle calibers. What calibers are common on ARs? Which ones would be fairly accurate to 300 yards? Also what caliber is the most cost effective? While I dont need an extremely powerful round because it mainly will be only target practice, I dont want something really weak either that wouldnt knock a squirrel over. After a caliber is chosen, I must decide on a few other things. Is buying a stripped lower and assembling the lower yourself and then purchasing a completed upper usually cheaper than a prebuilt AR? This is the route that I am looking at. What is everything that would be needed to put a rifle together? The stripped lower, lower parts kit with the grip and trigger, a stock, magazines, and a completed upper? Is there anything else that I dont know of? Where are some good websites that sell the supplies that are needed to make this all come together? Also any good links to any write ups would also be appreciated. Lastly, what are some quality brands for the upper and lower that I could go with to keep me within budget while still building a reliable, accurate rifle? Thanks all for any help, and Im sure ill have more questions as I progress.