I've been there for their stripped Bushy lowers. It's not a store that is staffed at regular business hours. They can do transfers and they have some mags and AR BCGs, parts, etc. The store is currently pretty darn small, but the guys I've met there are top-rate. Give them a call if you would like to stop by, perhaps they can meet you there.
They have a Facebook page, and also are active on the closed Facebook group "Colorado Gun Trader". They have an arrangement with Aero Precision to sell the AP rifles with some of their add-ons. They put out an invite on their FB page for anyone to meet them out at the range to test out the Aero Precision rifle and run free ammo through it. I was the only one who showed up and shot about 300 rounds of their ammo through their AP rifle. No problems, and no strings attached. Good group of guys just trying to start a small shop and hopefully grow it.