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Can you put a 10mm barrel in a g21
A couple of companies make 10mm conversion barrels But I do not believe a OEM Glock 10mm Barrel will work in a G21 Slide. THere are others on here who have done it so lets wait for them to chime in to make sure I am right:D
 

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Junior-G-man said:
On another note, can you use a G17 barrel in a G19? Would like to have that little extra length, 'bout a half inch I think.
That's how you make a G19L
 

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No, you cannot. The inner slide dimensions are different between the 21 and the 20.
 
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