chamber length of smg barrel?

UZIGUY1

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Hi All,
could someone clarify the chamber length of a standard 9mm smg barrel for me please?

thanks
 

MontanaRenegade86

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Looking at the schematic for Green Mountain Uzi barrels, it looks like 0.628 inches.

My semi profile barrel is ~0.626 inches +/-, if my math is right.
 
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UZIGUY1

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many thanks for your help, will measure later when i get in to compare, it doesn't feel right......
 

Jones

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Another handy-to-know detail is that a 9mm Para round (9X19) should protrude .135" past the end of the chamber mouth.
 

MontanaRenegade86

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So, I'm a dumbass.

In my previous post, I put chamber length as 0.628. That was one of the outside diameters of the barrel, according to the GM schematic.

If a 9mm cartridge should extend 0.135" past the end of the chamber mouth, wouldn't that make the chamber length 0.750" - 0.135" = 0.615"? I might not have got a very good measurement when I measured it last time.
 

Jones

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Bear in mind that I built a closed bolt semi Mini but the chamber dimns should be the same.
I found all kinds of external dimns for the barrels but no chamber details. Here's a picture of the reamer I used and I just kept going deeper until I had .135" of the round sticking out of the chamber mouth. A 9mm round's case measures .748" to .750" so your math looks right to me.
Here's the reamer I used.

thumbnail_IMG_1485.jpg
 

emrisg

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I would be careful using green mountain info. I bought a full auto barrel from the several years ago and it would not work in my gun. I could see the issue when comparing the barrel to an original imi barrel but they were not interested in fixing their barrel.
 

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