I received an AR rifle in the crucible as a reward and it can tussle with the Shingen. It's a workhorse; below are stat comparisons - my bad though it's from the mobile app as I'm at work right now. The stats for each are compared to my currently equipped scout rifle.
Hushwind has significantly higher attack (does not matter for normal crucible pvp however)
They both have the same rate of fire.
They both have the same impact.
Hushwind has better range.
Shingen has better stablility, but I can tell you the Hushwind's recoil is negligible.
Hushwind has faster reload.
Shingen has 2 extra bullets in clip.