Noob Alert! Just bought my first AR! Looking for advice...

[WilliamG]

Hey all,

Quick background. I think I'm insane. Brought up in London (where you get arrested for even DREAMING about guns), moved to the USA a few years ago, discovered guns in January, 2011, and since February 1, 2011, I've bought the following:

1.) S&W 686 Pro SSR
2.) S&W M&P 9mm Pro
3.) Remington 870
4.) Browning Buck Mark Camper URX
5.) Kahr PM9
6.) S&W M&P 15-22
7.) CZ-75 Shadow Custom

And...

...just bought my number 8! My first AR, Friday, April 1!: A new Knight's Armament SR-15 E3. I'm sure many of you will just at me because, seriously, probably more of a rifle than I'll ever need.... But I held it once and no other rifle compared....

Anyway, brought it home a few hours ago and added a Hogue grip, Magpul AFG and an Eotech EXPS0-3 that I'd ordered from Midway.

Of course, I've not shot it yet. I intend to take it apart and give it some sweet lube-lovin' first...

Was wondering if there's any MAJOR points I should know. My only other rifle is a S&W M&P 15-22, so this feels similar... yet... different!

Thanks, guys, and sorry if some of you think I'm nuts. I already know I am.