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Old 07-13-2020, 09:19 PM
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Default Barrel from M12 to M10?

Can I assume a 2'' barrel from a model 12 Airweight will fit fine in a model 10 frame? Thanks for your replies.
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Old 07-13-2020, 09:35 PM
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Yes, it will. However, you run the risk of destroying the M12 frame when you remove the barrel.
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Old 07-13-2020, 09:39 PM
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Yes, it will. However, you run the risk of destroying the M12 frame when you remove the barrel.
I'm purchasing a model 12 snub barrel already removed. Thanks.
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Old 07-28-2020, 08:23 PM
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Ok, just installed this model 12 snub barrel on my model 10 and I think I have too much gap. Itís straight up and down and good and tight. I havenít measured the gap Iím just going by sight but I think I have plenty of gap for one more turn of the barrel. What are my options?

Update: I since stuck a small Allen wrench in the gap and itís just a fit in there. .066Ē. I donít know what the tolerance is.
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Old 07-28-2020, 08:31 PM
WR Moore WR Moore is offline
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Visually, you appear to be far in excess of the generally accepted 0.004-0.008 in B/C gap. Your option is pretty much measure the current gap-assuming proper torque on the barrel, subtract, say 0.006 in and machine the difference off the barrel shoulder. You may then have to shorten the extractor rod and center pin to match.
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Old 07-28-2020, 08:53 PM
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Could I possibly do this work with a file?
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Old 07-28-2020, 11:11 PM
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You cannot put a model 12 barrel on a model 10 because the barrel shank that protrudes through the frame is too short. This is due to the fact that the cylinder on a model 12 is longer than a model 10. It is the same length as a model 19. The reason for this, supposedly, was that the extra length would help in the case of bullet jump in the lightweight alloy frame.
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Old 07-28-2020, 11:40 PM
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Quote:
Originally Posted by Piwo View Post
You cannot put a model 12 barrel on a model 10 because the barrel shank that protrudes through the frame is too short. This is due to the fact that the cylinder on a model 12 is longer than a model 10. It is the same length as a model 19. The reason for this, supposedly, was that the extra length would help in the case of bullet jump in the lightweight alloy frame.
Well it looks like IĎll have a model 12 barrel for sale I just got in today.
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Old 07-29-2020, 08:56 AM
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Another thought then.....so with this model 12 barrel, would a model 13 or 19 cylinder work to turn it into a 357? And if so would my existing yoke fit?
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Old 07-29-2020, 10:58 AM
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While people have reamed model 10s to take .357, it's not, IMHO, a bright idea. Depending upon which variant (10, 10-1,10-2,10-3 etc) cylinders aren't a drop in part, the ratchet has to be fitted. It might drop in, it might not. If yours is recent enough to have a drop in cylinder, you also have to get a model 19 drop in cylinder.

Be a whole lot cheaper/easier/safer to keep looking for that 2 inch model 10 barrel. Which still might require machine work to line up and gap properly. A thousandth or so, maybe file, beyond that, NO!

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Old 07-29-2020, 11:04 AM
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Quote:
Originally Posted by Piwo View Post
You cannot put a model 12 barrel on a model 10 because the barrel shank that protrudes through the frame is too short. This is due to the fact that the cylinder on a model 12 is longer than a model 10. It is the same length as a model 19. The reason for this, supposedly, was that the extra length would help in the case of bullet jump in the lightweight alloy frame.
Very interesting.

My M&P Airweight additionally has an aluminium cylinder to boot. Now I am going to measure that cylinder tonight

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Old 07-29-2020, 11:08 AM
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Quote:
Originally Posted by bluetopper View Post
Ok, just installed this model 12 snub barrel on my model 10 and I think I have too much gap. Itís straight up and down and good and tight. I havenít measured the gap Iím just going by sight but I think I have plenty of gap for one more turn of the barrel. What are my options?

Update: I since stuck a small Allen wrench in the gap and itís just a fit in there. .066Ē. I donít know what the tolerance is.
.066" is HUGE

In the olden days, the B/C gap was expected to be .004" - .008"

In Modern times one even as big as .012" is within spec.
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Old 07-29-2020, 11:17 AM
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Quote:
Originally Posted by colt_saa View Post
.066" is HUGE

In the olden days, the B/C gap was expected to be .004" - .008"

In Modern times one even as big as .012" is within spec.
Piwoís enlightening post explained the situation.
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Old 07-29-2020, 11:47 AM
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I have a lot to decide. K frame 357 cylinders are plentiful and K frame snub barrels are scarce since J&G started selling all these frames with no barrels. Plus I would have a 357 after I finished instead of a 38. My frame is a 10-7.
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Old 07-29-2020, 03:20 PM
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If you want to sell that 12 barrel message me. I would just install a 13 or 19 cylinder to make it work
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Old 07-29-2020, 08:21 PM
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I just got through purchasing online a model 19-5 cylinder and yoke to go on my 10-7 frame with the model 12 barrel I installed yeaterday.....LOL.
I'll have $300 invested in everything. Hopefully it will all fall together.
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Old 07-29-2020, 08:35 PM
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Quote:
Originally Posted by colt_saa View Post
Very interesting. My M&P Airweight additionally has an aluminium cylinder to boot. Now I am going to measure that cylinder tonight
I am sure you know the aluminum cylinder Airweights are considered unsafe to shoot. The aluminum cylinder was another great idea that did not work.
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Old 07-29-2020, 08:45 PM
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Barrel will be too short the model 12 has a longer cylinder.
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Old 07-29-2020, 09:30 PM
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Quote:
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Barrel will be too short the model 12 has a longer cylinder.
Did you read the entire thread?
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Old 07-29-2020, 09:38 PM
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Quote:
Originally Posted by Piwo View Post
This is due to the fact that the cylinder on a model 12 is longer than a model 10. It is the same length as a model 19. The reason for this, supposedly, was that the extra length would help in the case of bullet jump in the lightweight alloy frame.
I had no idea that 'bullet jump' was on their radar until the advent of the Scandium series a few years ago. Hmmmm....
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Old 07-30-2020, 05:41 AM
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Looking forward to "the rest of the story".
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Old 07-30-2020, 03:42 PM
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Sell the model 12 barrel.
Less headaches if you just purchase a complete 2" model 10 revolver.
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Old 07-30-2020, 10:25 PM
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Quote:
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Sell the model 12 barrel.
Less headaches if you just purchase a complete 2" model 10 revolver.
Then I'd have a model 10 frame with no barrel.
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