Please choose the rear sight picture:
M91/30 - Features a flat sight leaf on a tangent base with graduations from 1 to 20If your Mosin Nagant M91/30 has a Hex receiver: For regular scopes: Gen 4 Mosin Nagant NDT Scope Mount M9130 Hex ReceiverFor scout (LER) scopes: Gen 2 Mosin Nagant NDT Scout Mount If it has a round receiver:For regular scopes: Gen 4 Mosin Nagant NDT Scope Mount M9130 Round ReceiverFor scout (LER) scopes: Gen 2 Mosin Nagant NDT Scout Mount
M91 - Model 1891 - has a rear sight base with notches. Russian M91 bases have 5 notches and Finnish M91 bases usually have an extra notch and marked 2 (200 Meters)
M44, M38 or T53 (Chinese) has a shorter flat sight leaf on a tangent base with graduations from 1 to 10
Finnish Mosin Nagant M39 has "ears" at the rear to protect the leaf
For regular scopes: Full-length Scope Mount for Finnish Mosin Nagant M39 For scout (LER) scopes: LER Scout Mount for Mosin Nagant M39