it would help if you let us know the brand of the rifle or pistol that you are referring to and also the model number. Your question is kind of like where do I go to get my car serviced.
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Thanks. I have two HW100s. One in .22 and one in .177. I have had both serviced by Airguns of Arizona. I know they are in AZ and not on east coast but the are a HW100 dealer, do great work, guarantee their work. I had my HW .22 resealed and after a month it started to leak again. I gave them a call and they paid shipping both ways. If you want a quality job, you may want to consider them.