My recommendation, request a photo with the item or parts and a hand written note. Example: ("Item" in consideration for "buyer", from "seller" at the sniper's hide forum). If they don't answer back or they come up with some excuse to why they can't take those photos then its likely a scam. If they send photos of the items you're looking for, make a quick google search to try and find those exact photos, scammers are typically lazy about this and will bring up the first result they see. Pay close attention to the way they write down their ads and offers, reverse search some of the information they provide, you can typically pull up original posts from ads the information was ripped from. Lastly report everyone that has tried to scam you, do everything you can to get these guys off the forums.