Ordered my 18-8 stainless button-head socket cap screws from McMaster. They arrived yesterday. Went to work on them last night making the required adjustments.

Chucked in the drill press and used a couple of files to turn the heads to diameter and put a nice finish on them.

Cutting to length took a bit more fine tuning to get things perfect, but well worth it. Measured twice and cut once. Then fine tuned the final finished length with the file. Cleaned threads up for easy starting into the action. Sit perfectly flush with the action for maximum thread purchase and no interference with action function.

Will see if I can get pics of finished installed in the action if anybody wants 'em.

I bought 20 of the screws (2 x 10 packs) so should be set for a couple more builds or stock swaps. Thanks for the suggestions above on doing it this way. Very happy.