I'd like to ask for a couple of recommendations for some accessories but feel free to talk about anything AR-15 accessory related as well. I was looking at getting a sling for my Colt 6920. I was looking at the Vikings Tactics padded sling and the Magpul MS2. http://www.vikingtactics.com/slings_wide.html http://www.amazon.com/Magpul-MS2-Rifle-Sling-Black/dp/B002B93MCG Does anyone have experience with either? I wanted to also see how it felt to shoot with a vertical grip just for variety. They have a quad rail made by Global Military Gear that is only around 36$ and has good reviews. Is this the kind of item where you get what you pay for or is this a cheap option being that it's not something I'm going to permanently use? http://www.amazon.com/Global-Military-Gear-AR-15-Aluminum/dp/B002PI3IPO/ref=sr_1_1?ie=UTF8&qid=1358488849&sr=8-1&keywords=ar15+handguard Or would something like this weaver rail set be sturdy enough?