you could change to a higher weapons as soon you do are able to deal max damage with it
if your max damage with breer is around 10, you don't have to use it
those limited weapons have a good eco because you can have max damage (and a maxed min damage too) and a hit ability of 10/10
since your hit ability on a normal weapon is around 1.0, anything above would be better here, so that isn't the main point, since you will be higher with the Breer already i guess
so, the main point is the damage, especially because of the lower speed with the Breer, and to make it worth the buy, you should wait til you can at least deal max damage with it, if you can't, a normal weapon wouldn't be that bad, even if you dont have the maxed min dam there, but you can reach max dam, and even if the hit ability is lower
but as long you can live with the opalo101, you should do that