Ruger 10/22 poly Lever Extended Magazine Release for BX-1 Ruger rimfire rifles. Replace your fiddly flat base push button style release with this lever quick release for fast and easy BX1 magazine changes. The release extends 11mm making it possible to drop the magazine with the shooting hand, trigger finger. Easy to fit, no gunsmithing. upgrade to Part # B-34 + order the 10/22 deluxe buffer with this and buffer is only $8. * video clip shows how quick and easy it is to install (mine is not this brand)