This feat grants a buff with unlimited duration, that lies dormant until made use of (by reloading).
Buffs on other talent trees, which work in a similar way (gained by doing x, dormant until used by doing y), show the icon when ever the dormant buff is there.
With this feat, the icon only shows up once a reload is started.
Not entirely sure if this is intended or not, but it is inconsistent with how a bunch of other feats work.
It would be better if the buff was always displayed when ever it is in dormant state, and triggering the effect during reload should keep the same icon with “duration running out” animation that it has now.