Having perused most of the forum posts related to this subject (at least that I could find), I'm still looking for an authoritative answer on what my best option is for swapping the barrel in my Winchester Model 12. Here is the scenario: I own a 1946 Model 12 - 12 ga. in usable condition. I love the build quality and the history associated with this gun, but it is far from a collector's item. Somewhere along the line, a previous owner had the receiver, receiver extension, and the barrel parkerized in OD green (not the magazine tube, for whatever reason). The barrel was sawed off to about 20.25". It looks like he/she was trying to approximate a riot/trench gun. Also, the stock was cracked all the way through the pistol grip. I have since repaired the stock. I originally purchased this Winchester as a solid and practical home defense weapon, which it currently is. More recently, I've considered using this gun for hunting (for which it's all but unusable in its current state, unless I'm less than seven yards from my target). Initially, I thought I could just swap out the current barrel with another, longer barrel better suited to hunting. My research shows that (and I'm sure most of you would second), for these Winchester M12s, it's not that easy, and the barrel is certainly not something I can swap back and forth. I'm still unclear on whether the real trouble comes from fitting the barrel to the receiver extension or the receiver extension to the receiver (that's my first question). Currently, I do not want to separate the existing 20" barrel from the receiver extension; if I were to buy another barrel, I would probably get one already fitted to the extension. That being said, I think these are my options: 1) Purchase a longer barrel w/ receiver extension from the same time period and swap it out with the current barrel/extension. If so, will I likely need a gunsmith to do this? What are the chances that I get lucky and the new (used, but same time period) receiver extension fits perfectly onto my current receiver? 2) Have the current 20" barrel threaded for a choke. This may be a silly question and probably makes my inexperience obvious, but I'm trying to learn something. Would it make practical sense to attach choke(s) to a barrel this short for hunting? 3) Keep the Winchester as is and consider just buying another shotgun for hunting. This is the least attractive option to me, as I'd rather have few guns, each of which was versatile, than several guns each for a specific purpose. Thoughts? What are the factors that I haven't considered? Is there another practical option for me? Thanks in advance..