So I'm looking to do my first build, and I want to source most of the parts online since they're both cheaper and I have more selection, but I know I would either need to have the lower receiver shipped to my LGS, or buy one from them. I would also like to have help torquing the barrel and have someone look it over once I'm done, just for peace of mind. Is it ok to go into the store and basically say, "I'm not buying from you, but I still want your help"? I'm assuming they would charge for the service, but I still feel like it's rude. Am I wrong?