There are no "Common" 4 frame weapons. Their are the best of the best 4 frame weapons. These include:
- eth Tomb reaver 3 sockets (2 hander)
- 6 socket eth glitched berserker axe, with 5 40/15's and 1 shael (1 hander)
- Fury fanged knife (I think its 4 frames?, 1 hander)
- Rare Eth phase blade with 40 ias, 2 sockets, 290+ ed, fools mod (1 hander, absolute best 1 handed fury weapon imho).
There probably is 1 or 2 I am forgetting but these are the important ones.