"I just would like to know how many different brands of AR15/M16's are out there."
There are officially, too many to count, as far as I can tell at this point. Sionics is a small outfit catering to the LE, Border patrol, civilian market, etc. They do some nice work, not the cheapest, but use good part sourcing for their builds and stand behind their work. Mine uses a 1:8 chrome lined barrel, Vltor EMOD butt stock, A5 buffer setup, Magpul grip, Sampson front rail & Nickel PTFE coated bolt. Assembly pins are tight, not sloppy like the last one I had, just better quality of parts, fit & finish all the way around. Here's a link to their page for what I got. http://sionicsweaponsystems.com/store/p ... product=82
About ammo prices, I buy in bulk when there's a deal online. Prices have finally stabilized and dropped some, but there's still a high demand on some types which has prices artificially high. Still looking to buy some good 22 for a fair price, but it's hard to find the accurate stuff in bulk. The suppliers have choked the supply to keep prices high and are dribbling out a few boxes at a time with 22. If people would just stop buying for two weeks, at all levels, prices would start to fall and the supply would come back. As it is, there are still too many people doing the panic "buy-at-any-price" routine which limits supply and drives up prices.