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If you’re a DIY gunsmith building your own AR-15, then you’ll need the best AR lower parts kit available. This AR-15 lower parts kit available online at ThunderTactical.com includes all of the lower receiver parts you’ll need to complete your AR-15 lower. From the pistol grip and the trigger to the hammer pin and all of the vital springs needed for everything to function correctly, this parts kit has everything you need. Keep shopping gun parts online with us to find the other AR-15 parts you need.