The cheapest pulling gun is still marber bravo, altough it seems to change, it becomes less affordable these days. Still, price is advantage over other long range guns. Yes, you will get Plasma Weaponry Technology skill instead of LWT, but it won't hurt you a lot. At least not after few years ;P Rv50 is quite usefull too and gives skills with good markup. And it's the cheapest long range weapon available now. With some misadvantages (damage radius) and advantages (thanks to radius of damage you don't even have to see the mob you want to pull, e.g. something in rocky terrain with hills).
And there is one problem with long range laser guns: they are rare and thus quite expensive...
If u need tagging only weapon, A&P should do at the beginning. If you need some "softener" too, think about A3 Justifier MKII.
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