My gunsmith in Fair Oaks had a lot of Sig Sauer inventory for sale, if it's a Sig you're looking for. Gunwurkz
He's a real nice guy, Vietnam Vet and works out behind his house. It would be on your way in or out.
Flea market is the perfect description for Nagel's. I only go there if I have to (part, FIL drags me, etc). Some of the help is decent, but I went in there as a young man, many years ago and asked a clerk about a certain caliber. He threw a brochure across the counter and told me to "read about it". I've bought about 35 to 40 guns since then; not a single one from Nagel's.
Drury's is better, but crowded and high.
Good thing about my guy in Fair Oaks is you don't have what I call "lounge lizards" hanging around. The unemployed guys that eaves drop on what you need or are asking about and tell you "what you oughta do".