Does anyone still make these? Thanks

Rick

PR Bullet makes some.
5/8 https://www.prbullet.com/shop/products_view.php?sSKU=nef5.8
7/8 https://www.prbullet.com/shop/products_view.php?sSKU=0578

You can also call Metrics Unlimited. Their plug is very popular and very well made too.

1-800-638-7986 between 9:00 am and 3:00 pm EST M-F, You will need to know whether it is a 5/8" or 7/8" breech plug. The cost is around 35 bucks shipped to your door/mailbox , I'd ask for Bob who can help you out or direct you to someone who can

Thanks Overkill, Ill give Metrics Unlimited a call.