Unfortunately we can't give out the names of sites/retailers until you have your AV tag. I believe someone at that particular store does do Age Verification. You can check out their stock and get verified at the same time.
Site retailers carry various new guns. On the classifieds you'll find used, like-new (display pieces) as well as brand new (impulse buys).
H&K G36c (KWA) / Glock 18c (TM) / Kimber LAPD SWAT Custom (TM) / Mossberg M500 (ACM)