Should You Go Pistol or Rifle Caliber for a Micro ARP

One of the most important decisions you can make before setting out on a micro ARP (besides what upper/barrel length to choose) is what caliber, specifically, what cartridge, to focus the build around. Broadly speaking, you will ultimately need to go with either a pistol caliber or a rifle caliber. There are advantages and disadvantages to each which, from a high level, will be covered here....

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