If you enjoy the forum please consider supporting it by signing up for a NES Membership The benefits pay for the membership many times over.
Be sure to enter the NES/Pioneer Valley Arms February Giveaway ***Smith & Wesson SD9VE 9MM***
Rileys in Hooksett usually has quite a few AR parts in stock. You might try Manchester Firing Line as well.
Matt is kind of a tool anyway
Umlaut in Concord is hands down the best in NH - its a bit further north than Reileys but the products they carry are top of the line and Lars is very knowledgeable and friendly, especially with the AR platform.