In the past if you wanted scope your Mosin-Nagant to resemble the 91/30 PU you had to spend $300 plus just for the scope and mount. Firefield now sells a scope & mount for less than $180. Tapping & pinning for additional charge.
The stock still must be milled for an additional charge.
The bolt must be extended for an additional charge.
The Firefield PU scope WILL NOT fit in an original mount. The mount screw and pin holes WILL fit an action already set up to accept a side mount.
Going with the side mount allows you to still use you iron sights.