"Model 103.13" doesn't immediately tell me what kind of firearm you have. Could you please clarify the following:
* What brand is the firearm? (e.g., Ruger, Marlin, etc.)
* What is the full model name? (e.g., Ruger 10/22, Marlin Model 60, etc.)
Once I have this information, I can better assist you in finding a suitable feed tube.
General tips for finding feed tubes:
* Check the manufacturer's website: Often, you can find replacement parts, including feed tubes, directly from the manufacturer's website.
* Visit online gun parts retailers: Several online retailers specialize in gun parts. Some popular options include Brownells, MidwayUSA, and Numrich Gun Parts.
* Contact a local gunsmith: Gunsmiths often carry a wide range of parts and can assist you in finding the correct feed tube for your specific model.
Remember, it's crucial to ensure that any replacement parts you purchase are compatible with your firearm. Always consult with a knowledgeable source to ensure safety and proper functioning.