It's most likely an anti-Knightmare rifle.

Sniper Rifle Requip!

A rifle? How annoying.

What's up with the rifle? Are wargames your latest hobby or something?

You have to shoot with a rifle? What a surprise!

A few hundred days from now, there'll be a mural of you firing your rifle on their wall.

She intentionally aimed for their knees, shins, and other places that wouldn't be lethal with precise marksmanship.

From Ahagon-san of the programming team, an N16 Assault Rifle model gun.

C'mon, hand over the rifle.

I still have Mitch's rifle. I will try to cover you from here.

The SPT32 "Grad." Best sniper ever made, hands down.

Toss in the sniper. That is, unless you're scared...

Of you? I don't give a fuck 'bout you. Done. Rifle's on the table.