I've used rifles before, so I'm familiar with recoil.

[Archer brings up a good point, though; Erwin has never had to shoot one-handed, and he knows his balance is fucked by the missing arm. He'd been able to figure out extremely basic maneuvers with his gear, but that had taken far longer than it should have, and riding a horse had been a nightmare.]

Which ones are the lightest, but still have a good amount of force behind them?

[If Archer tries to stick him with a derringer, Erwin swears to god...]