Stoner designed the AR-15 platform to utilize a direct impingement gas system to cycle the action, and all this magic takes place within the upper receiver. Want more? Check out our AR barrel explainer. Understanding the laws and implications of owning or building a firearm is always 100% your responsibility. See “constructive possession” for more info on that as we are not lawyers and none of this constitutes legal advice (we are, after all, just monkeys randomly pounding keys on a keyboard). If you want to go shorter than that, you can get an NFA-registered short-barreled rifle (SBR) AR, either outright through a Form 4 or make one with an approved Form 1, or settle for an AR pistol which has its tradeoffs.īe incredibly careful when it comes to having a pistol-length AR upper and an AR carbine/rifle lower without a stamp and proper paperwork. There is, however, a tendency from some AR makers to market uppers and all-up carbines with 14.5-inch barrels targeting the M4 upper/home defense arena but with a permanently attached muzzle device or barrel extension to make up the difference and reach that 16-inch threshold. Many manufacturers bill their carbines as having 16.1 or 16.5-inch barrels just to have a skosh of extra insurance to keep ATF and Law Enforcement screeching harmlessly from the trees. To stay legal and in compliance with the National Firearms Act, rifles must have a minimum barrel length of at least 16-inches. Do AR uppers require an FFL or other ATF red tape? Taking it a step further, home builders/assemblers can start simply with a stand-alone lower receiver and add their selected AR-15 complete upper receiver of choice. Likewise, uppers can generally be swapped across several lowers, one of the reasons why ARs are sometimes referred to as “Legos for adults.” The modularity of the AR platform allows for an AR owner to have a single lower– typically the only serialized and controlled part– that will fit an entire shelf of widely different uppers and different barrel lengths, each with a separate purpose. With that, complete ARs, ready to fire right out of the box once function-checked and loaded, can be bought and used then later easily upgraded by swapping out the upper. AR-style rifles and pistols are truly modular, enabling the user of one to quickly swap out compatible upper and lower receivers in minutes with little or no tools and completely change the traits of the firearm.
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