Extra ammo consumption is a part of E-Tech, so that can't be gotten rid of.
I believe changing the manufacturer to something else would get rid of the Dahl burst-fire.
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Nope. Sorry.
---------- Post added at 02:42 PM ---------- Previous post was at 02:41 PM ----------
Why not just bump up your BlackMarketUpgrades (ammo SDUs) to much higher levels?