As a disclaimer, I don't play PvP - but I can tell you Send It a) only works with the combat sight - it makes no difference with marksman, and b) only has a noticeable effect on damage drop-off - not accuracy. After trying both sights for a while I only use marksman in PvE so don't run Send It, but ymmv for PvP if you prefer to run combat (when QBB is more like a fusion/scout than a fusion/sniper).
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Cheers for the input, will have a try with and without to see if it helps with the combat sight