Some helmets, such as the Commando Helmet which offers a 30% accuracy boost to Shooting Accuracy, have virtually no effect on the actual game-play.

At 5 tiles, a colonist's shooting accuracy is 97.2%

At 5 tiles with the Commando Helmet, a colonist's shooting accuracy is 97.2%

At 45 tiles, a colonist's shooting accuracy is 77.2%

At 45 tiles with the Commando Helmet, a colonist's shooting accuracy is 77.9%

These values emphasize how little effect the Commando Helmet has on actual accuracy.

Since accuracy modifying items are most obvious at the longest distance, a meager 0.7% difference for having a Commando Helmet (the literal epitome of UNSC military technology), seems either glitched or totally inaccurate.

It should be buffed to at least have an effect of 3% or so at the distance of 45, and maybe 0.1% at distance 5. Do I know how to do this? No, but I hope you do lol.