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The Importance of Choosing the Right Lower Parts Kit When building or upgrading an AR-15, the lower parts kit (LPK) is one of the most essential components to consider. These kits include critical parts like the trigger, safety selector, and bolt catch, directly impacting your rifle's performance, reliability, and ease of use. Whether assembling a custom AR-15 from scratch or replacing worn-out components, selecting a high-quality  AR-15 lower parts kit ensures your rifle functio …