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 CMMG Parts Kit, AR15, Lower Pins and Springs $13.99 Add to cart Magpul Enhanced AR Magazine Release $18.95 Add to cart Out of stock FORWARD CONTROLS DESIGN EMR-A ENHANCED MAGAZINE RELEASE AMBIDEXTROUS DIMPLED STD LEVER $66.50 Read more Out of stock SIONICS Lower Parts Kit – Deluxe – Single Selector $99.95 Read more