So... after some digging... because as a nugget-owner I do such things...

Found out that in Vietnam [url=http://forums.gunboards.com/showthread.php?294796-Mosin-m44-lam-with-rare-orig-Grenade-launcher-Swede-1902-mfg-M38-amp-93-Turk-Mauser]it was not uncommon[/url] to [url=http://forums.gunboards.com/showthread.php?118605-Grenade-sight-on-a-Type-53]take captured GI 22mm spigot launchers and weld them to the muzzles of their Mosins[/url].
-Thus allowing them to use French/US rifle grenades (and later, chinese copies).

Missed an opprotunity, I guess...
[img]http://www.hunt101.com/data/500/68launcher.jpg[/img]
^That's a Romey SKS, 59/66 if I'm not mistaken. Otherwise it's a crude Type 67 add-on.

Range was about 150 to 200 meters for lighter frag-nades. (175 max for modified hand grenades due to time-fuze)
-About 50 meters direct-fire with that heavy monster of a nade.

Others would just saw-off the barrel of their mosins until the barrel diameter was close enough to 22mm to function as a nade-launcher and appropriate ranging-grooves were then cut.

[hider=As the war progresses, Ghe will carry an ever increasing number of grenades][img]http://www.imfdb.org/images/thumb/2/25/FlowersOfWar-Type67-2.jpg/600px-FlowersOfWar-Type67-2.jpg[/img][/hider]