You can build an AR or an ARP in 5.56 like everyone else does. Or you can choose a 9mm AR upper for your build and make something unique.
There are plenty of good reasons to do that. Here are just a few.
Cheap Ammo
The fact of the matter is that 9mm ammo is far more affordable than most other cartridges except common rimfire rounds like .22. It’s comparable to...
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