I have a limited supply of detachable box magazines for Weatherby Mark V Long Action only for sale. They work from calibers 7mm mag to 460 Weatherby. The bottom metal itself is a anodized black. The mag holds 5 rounds depending on the caliber. It holds 5 rounds of 300 Weatherby mag. The mag measurements are 3.79 inches x 0.784 inches wide. Gunsmithing is required for proper fitment and function. They are $400 a piece and that includes the bottom metal and 1 magazine, plus free shipping to the lower 48! Below are pics and a link to the video. If you have any questions please PM me.