Less all the time, it seems. Heritage Firearms vanished a few years back, so did most of the pawn shops that sold used. Only one pawn shop I can find in Manchester that does, and they're only open 9-4 weekdays, period. (which is useless for anyone who, say, WORKS!)...
Otherwise, there's:
Affordeable Firearms, Pelham
- looks like a gun show collided with a WWII arsenal and museum of strange and old ammo, good deals. Fun place to dig through. GREAT prices on new S&B in hard-to-find calibers like 7.62x25, Mak, .25ACP...
Riley's Guns, Hooksett - Always busy, lots of staff, prices are eh on guns, but they get some odd stuff, the place is big and clean and has good deals on ammo that it's hard to get most places. (Gold Dot +P and 9mm +P short barrel, Hornady TAP older and better stuff). Good prices on accessories. Also, all the ammo is out on the floor on shelves (not behind the counter), so you're free to open boxes and compare rounds.
Pete's Guns & Tackle, Hudson -
Overpriced used Glocks, some interesting old rifles and shotguns if you're into that, but most things old stock covered with dust and you have to try to look into the cases past the seemingly same group of very large, elder 'commando' sorts in there every day sitting, BSing and eating fast food.
Sportsman's Trading Co, Amherst -
Who wants overpriced guns PUSHED on them by a PUSHY, loud, used-car-salesman owner? Friendly black lab wandering around is a redeeming feature, but the owner's attitude is a total turnoff. The owner could take a lesson from the dog.
did them in. 
I go to Guns are Gold.....er Collectors Firearms, but the guys know me there (been going there for 20 years) and occationally get a "deal".
