These dual BX-25s allow you to have the convenience of 50 rounds of 22LR without the need for a magazine coupler. This magazine features a unique design that integrates two BX-25 magazines into one. After you shoot 25 rounds, simply eject the magazine, flip it over and re-insert...It's that easy! These include a dust cover and are tested to feed as reliably as standard 10-round 10/22 mags.