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Yes the weapon is awsome you can destroy anything with it, it's fun to use it combined with the sputnik skull.

I know the one off of cheat, but I wanna know where these others are....

Yeah its realy fun playing with the scarrab gun the only problome its only on the mtropoles level. its also cool that you can play with a soccer ball on in that torn appart building

there is also a scarab on the great jorney its in St jonsans scarab how the person got it i don't know

I have used this weapon before, but very anoying to get to. in metropolis after you get over the bridge you need to get a banshee to follow you to the next check point,without getting in it or killing it, you need to get in a split-second before the check point or it will explode. then fly up to a bridge very high up it will look like a plasma rifle but it shoots like a scarab.
or refer to this website for clearer details: http://www.eeggs.com/items/44814.html

i have never heard of this before, i think they had a mod on because poeple have gotten in the scarab before but said nothing about a scarab gun. if you really want i can look into it.

so where are they. one is on the big bridge that you can get to with banshee (or nade jumping if your crazy), where is the other?

Dude there's like 4 Scarab Guns. Supoosedly 2 on Metropolis, 1 on Outskirts, and 1 on the Great Journey. I think when ever there is a Scarab there is bound to be a Scarab gun.