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Posted: 1/20/2021 7:35:54 AM EST
Talking about Gen 4 only since I know they share the same frame. The 41 slide is a little thinner, Has only tried to see if a Glock 41 barrel will function in a 21?

I have 3 barrels for my 41, so would like to get use out of another at least.
Link Posted: 1/22/2021 4:41:25 PM EST
I don't think it will work, I'm pretty sure the G41 barrel dimensions are bit different than the G21, thinner in most all regards.
Link Posted: 1/24/2021 1:44:20 AM EST
For gen4 the 10mm barrels will fit into the 45 frame/slide but the reverse is not true.

Check out my thread HERE
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