First off: I am not a gun-owner, and claim no first-hand knowledge of guns, but simply what I have learned from my 12 hours or so of research so far. Please understand this in my post, as making fun of me for a lack of knowledge is going to be somewhat pointless. So, I am planning on writing a book. It has a post-apocolyptic setting (non-nuclear) and a character is looking to have a practical weapon. In that light, the considerations lean towards reliability, low-maintainance, and abundance of ammunition. My research so far has lead me down to the S&W 547 9mm revolver. Vintage Pistols - Smith & Wesson 547 Range Report I am pretty set on this concept, as 9mm ammo is very common in the US where the story takes place, and revolvers are famous for their reliability (even the 547, from the fans of the gun). However, my lack of knowledge prevents me from moving much further: The 547 normally comes in only two types of barrels: the 3" and 4" barrels. I am trying to figure out if there is a feasable way to attatching an extended barrel, around 5 to 5 1/2"? In particular, would the gun still function with a 357 barrel, or could one even be attatched? The conceptual goal would be to lower the larger-than-normal recoil on the 547 model, and aid in the already great power and accuracy. If this is impractical, than the character would likely sit on a typical 4" 547, but I, as one who has no gun experience, would have no knowledge of it's practicallity. So can someone answer this for me?