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I was patting myself on the back about what I good job I'd done in sorting the AR magazines and keeping inappropriate ammo out of barrels not made for it.
5.56x45mm for 1:9 or 1:7 twist goes in a PMAG.
5.56x45mm for 1:12 goes in an aluminum USGI.
6.8x43mm goes into a stainless steel mag with purple tape around the base (tactile and visual!).
It all fell apart when I remembered that my XM177E2 clone has a 1:9 barrel and I can't remember if it's zeroed for M855 or M193... But I've been using USGI 20-rounders... I think it's zeroed for 55gr.
The M16A2 clone also has a 1:9 barrel, but for photos, I have a USGI 30-rounder loaded with M855, complete with green tips.
I've gotten away from 1:9 since I started this AR thing.
Kaylee started with 1:9 and now wears 1:7.
Two of the remaining 1:9 are retro SBR's.
All the home-defense guns are 1:7.
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