Home / AR Lower Components / SOLGW MIL-SPEC RECEIVER EXTENSION CASTLE NUT “CMMG Parts Kit, AR15, Lower Pins and Springs” has been added to your cart. View cart SOLGW MIL-SPEC RECEIVER EXTENSION CASTLE NUT$10.44 4 in stock [] SOLGW MIL-SPEC RECEIVER EXTENSION CASTLE NUT quantity Add to cart UPC: 785939517545 SKU: CASTLENUTMS Category: AR Lower Components Tag: solgw Product ID: 16084 Description Description SOLGW MIL SPEC RECEIVER EXTENSION CASTLE NUT You may also like… SOLGW AMBI SAFETY SELECTOR KIT $33.25 Add to cart Related products Out of stock BCM GUNFIGHTER QD End Plate $16.95 Read more RADIAN WEAPONS TALON AMBIDEXTROUS SAFETY SELECTOR 45/90 DEGREES 2-LEVER KIT $64.95 – $69.95 Select options This product has multiple variants. The options may be chosen on the product page Out of stock Magpul MOE Trigger Guard, Polymer – AR15/M4 – FDE $8.50 Read more Sons of Liberty Gun Works Blaster Starter Kit $54.15 Add to cart