Just noticed the existence of this shop in the group buy thread for the C.A.T. M4 bolt cleaning tool and stopped in tonight. Hands down my most pleasant customer service in any shop I've been in (intentional lack of specificity there--not just best service in any gun shop I've been to in Mass, but the most notably positive sales/service experience I've had for anything, anywhere). Bravo!
Greg and Chris were welcoming, patient with my new-to-black-rifles questions, eminently knowledgeable, an all but literally bent over backwards to be of assistance in every conceivable way. Greg disassembled an AR bolt and showed every function of the C.A.T tool when I simply asked if he had any on hand. Chris did on-the-fly web searches to address some of my most obscure questions.
I was particularly impressed by their scrupulous ethics and genuine concern for the customer. The very concept of a shop's staff spending hours taking apart each "pre-ban" mag in their extensive inventory to actually confirm that each one is actually, provably, and unequivocally pre-ban is refreshing to say the least.
I will certainly be back to tart up the new (well pre-ban new to me) AR with all manner of Magpul goodies they have in stock at great prices.
TL;DR: Great, trustworthy guys running a gem of a well-stocked, friendly shop. Wouldn't hesi ate to recommend or return. A+++