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Isaac, the receiver contains a Seekins Precision Enhanced Bolt Catch, a receiver tensioning screw, an oversized trigger guard and includes an ambidextrous-bolt stop assembly. Custom screw-in dowel pins simplify your setup by eliminating the need for roll pins, hammers and punches. A quick-access magazine release and a beveled magwell allow for rapid magazine changes and work with most all AR magazines. . . . Seekins Precision SP223 Gen2 Lower Features and Specifications: . Manufacturer Number: 0011000008 AR-15 MIL-SPEC Lower Receiver Material: CNC Machined 7075-T6 Billet Aluminum Finish: Black Type III Class 2 Hard-Coat Anodized Ambidextrous Bolt Release Enhanced Bolt Catch Ambidextrous Bolt Stop Assembly Oversized Trigger Guard Upper Tensioning Set Screw Screw-In Pins Bullet Pictogram Markings Engraved SP Logo Made in the USA . Stay safe & have a great day!

Hi Isaac and welcome. You are correct, this lower needs a Lower Parts Kit for a fully functional lower. Cheers and stay safe!

Yes, this will need a lower build kit to complete. Below is a link to quite a few different kits to choose from depending on ones budget. budsgunshop.com/search.php/q/lower+parts+kit

Isaac, correct, this includes a Ambidextrous Bolt Stop Assembly but you will still need majority of a lowers part kit. Hope this helps.