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AR15.COM
11/1/2021 7:23:05 PM EDT
I just picked up a Banshee in 10mm and NONE of my (12) factory Gen 3/4 Glock 15 rounders will lock into the lower, but the supplied "big stick" locks in with no issues. It feels like it is hitting something in the lower and not allowing it to lock. I wanted to make sure this was 100% before I submit paperwork to SBR it.


Also wanted to build an upper in 45acp, I assume the 10mm lower will work with a 45 RDB style upper, correct?
DAV Life Member
1/8/2022 6:51:43 AM EDT
[Last Edit: amphibian][Edited] [#1]
Originally Posted By muta4warrior:
I assume the 10mm lower will work with a 45 RDB style upper, correct?
View Quote
No.  The 10mm uses a different mag height.
See this 2nd post on this thread:
https://www.ar15.com/forums/AR-15/-ARCHIVED-THREAD-CMMG-10-mm/15-743632/?page=2

I'm pretty sure that was CMMG that confirmed in that thread a couple years ago.

Official CMMG video also confirms this
CMMG Platform Overview - MkG (45) and Mk10

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