I picked up my first AR-15 last night. It's a Colt CR 6724 HBAR Elite...CAR3 "Colt Accurized Rifle". Came with a Magpul PRS stock and a PSG style grip.
Previous owner said he only fired 100 rounds through it and I think I believe him as it it super-clean.
Off to the range tomorrow and pop off a few. I've fired 30 rnds through my neighbors AR-15 a few weeks back, otherwise I haven't fired a rifle in over 30 years. I'll have to re-learn.