sorry all SOLD OUT, hope to have more in about 3 weeks. M-Lok sling adapter with 1 1/4" push button QD swivel so you can quickly attach or detach slings. OR D shape swivel 1) Short base 22mm centres 2) Long base 33mm centres 3) D short base 22mm centres 4) D long base 33mm centres * select which one you want.