Get Reload announce that they too have the Gen.3 Mosin Nagant Sniper Rifles in stock. When they mention Gen. 3, these are the latest gas-powered versions now developed under the auspices of Ares Airsoft. They have two versions: the basic one which comes with the usual dummy bayonet, and the scoped version which comes with its own PU scope apart from the bayonet.

Zeta-Lab Mosin Nagant Carbine W/ Bayonet 2 (Gas Bolt Version)

Zeta-Lab Mosin Nagant Sniper Rifle+PU Scope (Gas Bolt Ver / Gen3)