Home / AR Lower Components / ERGO CASTLE NUT ERGO CASTLE NUT$6.99 1 in stock [] ERGO CASTLE NUT quantity Add to cart UPC: 810049123000 SKU: 4971-B Category: AR Lower Components Tag: ERGO Product ID: 37453 Description Description Standard Mil-Spec CAR castle nut Made from steel and coated black Fits AR-15/10 You may also like… LBE UNLIMITED CASTLE NUT $8.99 Add to cart Related products Out of stock Magpul MOE Trigger Guard, Polymer – AR15/M4 – FDE $8.50 Read more Magpul ASAP – Ambidextrous Sling Attachment Point $30.35 Add to cart Magpul B.A.D. Lever – Battery Assist Device – AR15/M4 $31.30 Add to cart Bravo Company Manufacturing MIL-SPEC Carbine Stock Hardware Kit $57.95 Add to cart