This is the Anschutz 5 round .17HMR magazine for the Anschutz 1761 series rifle.
Made from stainless alloy with a tough polymer base grip it is strippable for cleaning.
At present there is no larger capacity version available.
Fitment notes: this will fit earlier .17HMR models with modification e.g. Anschutz 1517, a small bump on the front top section of the magazine needs filing flat and the top edges gently filing to remove sharp edges. Customers have reported the magazines cycle well after these modifications.