There is a new Mosin-Nagant replacement stock being made by Archangel. For a variety of reasons, making a detachable magazine for the Mosin-Nagant rifles has been difficult. The basic rifle design is more than 120 years old, so adapting it to modern conventions is bound to have a few difficulties.
A quick check of YouTube found this video from mixflip on the new Mosin-Nagant stocks from the ProMag/Archangel booth at the SHOT Show:
Brownells introduced the Foreign Weapons Field Kit, a tool kit designed to service Soviet-bloc firearms in the field. This tool kit may be of great interest to Special Forces and other allied troops who work closely with the indigenous peoples of Afghanistan and Iraq, as well as the thousands of military surplus firearms collectors here in the United States.
The kit contains tools for servicing a variety of Soviet-type foreign weapons, including the AK-47/AKM assault rifle, PK/PKM/PKMS 7.62mm machine gun, Dragunov SVD sniper rifle, DShK/DShKM 12.7mm machine gun, and RPG-7 grenade launcher.
The foreign weapons field kit lets you field-strip these weapons quickly for cleaning, maintenance, adjustment, and repair without the confusion and down time spent scrounging for the proper tools.