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You can pass a sling through the fixed slot in the stock or install a QD attachment point in the hole you mentioned. They aren't included with the stock but can be found here: https://www.budsgunshop.com/product_info.php/products_id/131893/magpul+mag333blk+sling+mount+kit+type+1+black+steel+rifle+ar-15+m4+m16

Hi Roland and welcome. The Quick Detach sling studs will fit the QD Hole at the top rear on either side no issue (This Magpul Sling will be a direct fit). : https://www.budsgunshop.com/product_info.php/products_id/114356/magpul+mag939-blk+ms1+qdm+sling+1.25+w+adjustable+two-point+black+nylon+webbing+for+rifle -------------------- Cheers, stay safe and enjoy!