Free: Contests & Raffles.
If you dont wanna spend a fortune on an ar15, and you like the s&w rifles, they have a s&w m&p sport model. It is lacking forward assist and dust cover, but it can be had for $650-700. Always an option Wildfire
I'm with Huntnphish. How do you plan to use the rifle? If you're not too gunsmithy and this is going to be a home defense rifle I would keep it simple and go factory. I own a S&W M&P 15T for this purpose. Seems to be a great rifle but I don't have too many rounds through it--maybe 100.If you're looking for a long range coyote gun then absolutely you should build your own. Esp for a stainless steel barrel. I'm not sure the legality or the process of buying a lower receiver from one manufacturer and the rest of the parts elsewhere to circumvent the federal tax but I've heard of it being done a lot.