If you've been searching for an AR pistol build kit, you're probably looking for a compact, hard-hitting build that doesn't require NFA paperwork. AR pistols have exploded in popularity over the last few years — and for good reason. This guide covers everything you need to know: what's in a kit, what to look for, legal basics, and how to put it all together. What Is an AR Pistol? An AR pistol is an AR-15 style firearm with a barrel shorter than 16 inches and no stock. Instead of a traditi …