If it's small enough, and if the stated engine cap is high enough (190, rather than 170), it should be 170kph of pure harassment -- at least until someone tags you with an AC/20 round, and your mech folds in half.
I'd advise moving that ton of MG ammo out of your CT, though. No sense making things easier than they need to be for your enemies
Edit: To clarify, one of the developers mentioned on twitter that the engine cap of the locust will be 190. This was not mere speculation on my part.
Edited by Asyres, 10 October 2013 - 07:10 AM.