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Building or upgrading an AR-15 rifle is a journey that requires careful consideration of each component, and one of the most critical pieces of the puzzle is the  AR-15 lower parts kit. This kit is the backbone of your rifle’s functionality, housing essential components like the trigger, safety selector, and springs. Choosing the right lower parts kit isn’t just about completing your build—it’s about ensuring reliability, precision, and long-term durability in every shot you take. Whe …