These are fiddly to replace and most aftermarket FP's need to be dressed for burrs, thickness, overall length and particular attention to the projection at the rear. There will be an internal return spring and "guide" pin, the "pin" goes towards the front. Remove it, then with a stone or fine grit sand paper on a block gently remove any burring. Put another four "parts" rifles together since, once understood they're pretty easy to work on.įailure to fire most likely relates to a sticky/broken/worn firing pin. Broke a firing pin, otherwise it's been faultless for 10's of thousands of (SV) rounds. Picked up my first M.12 40 or so years ago. If it is missing, then I would research the date of manufacture (serial number) using the sticky in this section, to ensure the correct type is ordered. One of it's functions is to help guide the nose of the round into the chamber and its absence would likely result in the problem that you are having. This component fits into a slot in the barrel just below the chamber/bore. It became fairly obvious to me at that time that this component could very easily get lost during strip and clean operations. I think that, depending on age, it will be one of these two designs. I bought a model 121 some years ago and it did'nt have the retainer, being in the UK where such spares are hard to get and shipping from the US difficult, I had to make one!
![remington model 12 serial number 777499 remington model 12 serial number 777499](https://s3.amazonaws.com/mgm-content/sites/armslist/uploads/posts/2016/11/03/6073855_01_remington_model_12c_octagon_ba_640.jpg)
while you had it stripped for cleaning did you notice whether the cartridge retainer was still present?