I got mine last year and everyone has wanted one since. I know back then the model numbers were important. M1A or something along those lines were the newest models. The battery shat on me and I didn't realize it might still be under warrenty and threw the battery out. Now I see there are even newer models, but does it matter now that they've worked out the kinks that were happening before the M14? And I am probably getting it from ebay. Does it have to be by an "authorized dealer" to get the warrenty?