SASS Shooters Handbook for rifles for side matches:
• Front barrel sights may vary from simple blades to period hooded wind gauge designs using interchangeable sight inserts and
having a spirit level mounted integral with the sight or sight base.
• Rear sights must either be open iron sights mounted on the barrel or original style tang or stock wrist mounted peep
sights. Long range rear barrel mounted sights of the flip-up ladder type may use a peephole drilled through the sliding
sight leaf. An example of this is the various ladder type sights used on the Springfield trapdoors.
Sounds like you are right on. You can check the handbook for further questions.
http://www.sassnet.com/Shooters-Handbook-001A.php