Construction project manager (retired) - Nikon Sunshade 40mm

This new replacement sunshade does fit my existing 40mm Nikon scope, but not as well as the original sunshade that came with the scope. The scope I have is an older model Buckmaster 6x24x40. The old sunshade fit the scope tube diameter perfectly, whereas this new one has a different tube diameter, although it does screw onto the objective lens 40mm threads for a solid mechanical lock, so I can use it in the field. Before I ordered the replacement sunshade I checked with Nilkon to make sure it would fit my older scope, although it had a different part number.