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This how-to guide assists in installing an AR-15 lower parts kit, also known as an LPK, providing the necessary steps and tools for a successful assembly. An AR-15 lower parts kit is a collection of essential components needed to complete the lower receiver of an AR-15 rifle. These kits typically include the trigger assembly, safety selector, magazine release, bolt catch, and various pins and springs. The lower receiver houses the trigger mechanism and magazine well, making its assembly cru …

The following is the method that the ATF uses to measure the barrel length of an AR 15 or variant at the time of writing this article.First Things FirstWhen preparing to measure the length of an AR-15 barrel, prioritizing safety is paramount. First and foremost, ensure the firearm is completely unloaded, removing the magazine and clearing the chamber of any rounds. It's wise to double-check this to eliminate any potential risks.Opting for a clean, well-lit environment can enhance precision and s …