You will have to email or call around to the larger gun ships to see if they have one in stock. It was introduced in the Browning Abolt line and possibly some Winchester featherweights they were only produced for about three years. Since the Abolt rifles were the primary candidates for the 243 WSSM, and are no longer in production can make it challenging to find a magazine. Perhaps one of the gun shops here will add comments on availability.