I am a MA resident with an unrestricted Class A LTC. I originally moved to MA from another, much more gun friendly, state and brought my weapons with me. I have not bought a gun in MA yet. 'm currently out of state for a few months and would like to buy a Remington 870 Model 81180 W/ Knoxx SpecOps Stock. This is a 20 ga 870 model (pump) with 7 round mag capacity and a Knoxx recoil-absorbing, adjustable length, pistol grip-type stock. I believe that this is a legal gun in MA (at least with my Class A LTC). I'd like to confirm that it it legal. Secondly, I suppose the state of MA will want me to somehow register this weapon. I believe I have seven days to file the paperwork after acquiring the shotgun. Is that correct? Does it matter that both I and the gun will not enter MA for a number of months -- i.e., will the kind folks running the MA bureaucracy allow me to defer registration until I actually return to MA? Finally, is there any legal way to avoid registration? Thanks.