I think modding every weapon you pick up is a good way to "Test out" mods. Why not? But don't waste good stuff you'll want back on low rarity weapons. If you get a Telescopic scope III then INSTEAD of putting it on that green buy a Telescopic Scope I from the vendor for a cheap 500 scrip and put that on it.
Then, If you like it you can:
- Make note of that mod and hang onto it
- Strip the currents mods and put the higher one on it but again you might wanna wait until you find a better grade of weapon.
- Or If you hate the mod and are finished leveling the weapon you can strip the mods and/or sell/breakdown the weapon