This version of the MAG47 includes a pre-installed Weapontech BHO follower vs our standard AK follower. If you are not familiar and BHO follower for an AK is essentially a last round indicator. When using the BHO follower, the trigger will go hard versus allow you to pull and get a click in a traditional set up. Once you remove the magazine, the AK bolt will still close. We worked closely with Weapontech and many AK builders to ensure 100% reliable functionality. The testing has been very extensive firing 20,000 plus rounds. The MAG47 has proven to be extremely reliable. We also worked extensively with manufacturers to make certain this magazine fit into every rifle we could get our hands on. The MAG47 lives up to the renowned reliability of the AK47 platform. Note: WILL NOT SHIP TO CA, CO, MD, MA, NJ, NY, VT, DC, CT, HI or INTERNATIONAL.