This is a 50 round factory magazine for the Ruger 10/22. This magazine is (2) BX-25 magazine molded into one magazine, they are not screwed, bolted, or glued together. The middle piece of the magazine is fabricated into 2 opposite facing BX-25 magazines, that's right, it is one piece. Each magazine comes with one factory dust cover

BX-25X2 10/22 Magazine Works with any factory original Ruger 10/22 77/22 SR22 rifle and 22 Charger pistol, and American .22LR rimfire rifle. - 25 round x2 - With Ruger logo and markings. Can be disassembled for cleaning via stainless screws.