...And I have a few questions: I've always been a Kalashnikov fan, but I finally broke down and bought my first AR. It's a used gun, and there's a few things I'd like to know about it. It's a shorter, lighter version of the full-size AR, with a 16.5-inch barrel, a short handguard and 3-position collapsible stock. The receiver stamping says: Colt (with logo) SPORTER LIGHTWEIGHT CAL. .223 And I'm fairly sure it's a pre-ban because the serial number is " SER. SL 004xxx " Does anyone know if this particular model was numbered sequentially? If so, this rifle is older because it was the 4,000-something one produced? (and what does the "SL" mean?) I know how to field-strip the rifle, but I'd like to know how to completely disassemble the lower receiver so I can re-finish it. That involves removing the mag release, bolt release, safety, trigger group and the "strap" on the trigger guard. Does anyone have any links to any online tutorials to do this? I'm very competent with guns, but I don't want to go poking around with a hammer and punch without having some kind of guide. I've got plans to accessorize this AR, but I'd like to become more familiar with it before I go slapping on a bunch of picca-thingy rails :icon_chee. Any help and advice would be greatly appreciated.