Several in the Lancaster/Lebanon area, Shyda’s is in Lebanon Pa, as others have said, it isn’t what it used to be.
Not far from Shyda’s is Richland Shooters Supply in Richland Pa. A short drive to Middle Creek Wildfowl Area is Darryl’s gun shop,it’s small but well stocked, In Ephrata Pa is Mussers outdoors and in Bowmansville there is Kerper’s gun shop, all are small family owned local gun shops, you never know what you might find on the used rack plus all the stores are a short drive off of PA turnpike rte76. If you’re into custom guns, Mark Bansner’s shop is in Adamstown also a short distance from rte76. These are the shops that I visit on a regular basis.