Details
Any safe alteration to a Model-12 WILL gain the ability to use shells that can be found at any shop or store, and not need to have special order shells or reloading.
The chamber length is one small part of a conversion, but the main visible alteration is the opening and "squaring" to modern configuration of the front of the ejection port. Got to clear those newfangled long shells. They've only been in use since before WW2, after all.
From this:
to this:
Any gun already put through typical years of field use is not a "collector" gun, especially when made in the numbers that Model 12's have been.
They can be desired and "collectible" in any decent condition, but being shootable with all typical available ammo is definitely a useful point. Model 12's benefit from conversion to modern configuration, and all of them are able to take modern pressure shells, if no mechanical defects are present.
Anyway, the reason that the old "surplus" unaltered stuff is so valuable now is the lack of untouched examples. Therefore, if nobody had butchered all of the Smith-Corona '03's they wouldn't be nearly so scarce and valuable to "collectors". Let's see how many collectors of SKS's are around in 50 years. Very few decent examples will be around of the most desired versions, so why aren't you stocking up on them now?
If I give away an older gun, I'll make sure that there is minimal fuss with ammo selection and safe use. I'm not going to leave the original classic lube and dirt on it, or not upgrade an old cleaning rod and kit, if necessary, either.
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