Home / AR Lower Components / ERGO CASTLE NUT Out of stock ERGO CASTLE NUT$6.99 Out of stock Want to be notified when this product is back in stock? Notify me 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 B.A.D. Lever – Battery Assist Device – AR15/M4 $31.30 Read more Magpul Enhanced AR Magazine Release $18.95 Add to cart Out of stock Magpul MOE Trigger Guard, Polymer – AR15/M4 – FDE $8.50 Read more CMMG Parts Kit, AR15, Lower Pins and Springs $13.99 Add to cart