This is the 4 round .22-250 magazine for the Browning BLR.
Compatible with all post 1981 BLR models. Browning moved to an AR-15 style rotating bolt in 1981 which locks into the barrel and allowed use of an alloy receiver.
Earlier models had receiver locking bolts (and steel receivers) which used a different mag fitment. Browning no longer support Pre 1981 format magazines.Made from blued steel this factory replacement magazine is a double stack design wth a stainless follower.