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Old 01-14-2014, 12:34 PM   #11
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There is a .05 thousandth difference in casing diameter between a 40 and a 45 so it actually a smaller difference in those then a 9mm to a 40

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Old 01-14-2014, 01:25 PM   #12
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Quote:
Originally Posted by gunny91 View Post
There is a .05 thousandth difference in casing diameter between a 40 and a 45 so it actually a smaller difference in those then a 9mm to a 40

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The rim diameters are:

9mm is 0.394
.40 is 0.42
10mm 0.425
.45 is 0.480

Using bore diameter can be deceptive, because the 9mm is a tapered case. The difference may not be enough to harm reliable extraction, but that would be my concern based on breech face dimensions already possibly being a bit generous.

I would also think a stiffer recoil spring may be needed for the 10mm since it is a higher pressure round.


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Old 01-14-2014, 02:17 PM   #13
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I assure u it will run were talking about a glock there built to run anytime anywhere

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Old 01-14-2014, 03:07 PM   #14
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Oh I don't doubt that it will run, just wondering about how optimally it will run. It might be prudent to have a bit more extractor engagement for reliable extraction under adverse conditions when the breech face may get a bit messy, or there is a failure to fire due to a bad primer.

Just pointing out that if one can afford a whole upper half, it may be a better option in the long run.

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Old 01-14-2014, 09:02 PM   #15
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I always thought the conversion barrel was a sketchy idea ...yea it works but like u said if a man had the money just get another slide

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Old 01-15-2014, 05:23 AM   #16
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Quote:
Originally Posted by SSGN_Doc View Post
The rim diameters are:

9mm is 0.394
.40 is 0.42
10mm 0.425
.45 is 0.480

Using bore diameter can be deceptive, because the 9mm is a tapered case. The difference may not be enough to harm reliable extraction, but that would be my concern based on breech face dimensions already possibly being a bit generous.

I would also think a stiffer recoil spring may be needed for the 10mm since it is a higher pressure round.
The 10mm is a high pressure round (in many loadings). With the reputation Glock already has for case failure with the unsupported chamber, do you think it is a good idea to leave that much more area unsupported?

The 9mm and .40 shell plates for reloading are almost interchangeble. That is how close the base diameter is. Try resizing a 10mm (or 40) case in a .45 shell plate. You will rip the head off more often than not.

Storm Lake and some people may tell you it will work, but I prefer to use the appropriate slide for that job. I have a G-20 and plan on getting a .45 slide to ad to the versatility of the gun. I already have .40, .357 Sig and 9mm conversion barrels for it. They work. The 9mm uses a lighter 10 lb recoil spring because of the slide mass.
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Old 01-15-2014, 10:53 AM   #17
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Thanks for the replies. I guess I'll start looking around for a used 20, Gun show this weekend. We'll see what turns up.



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