Rock Island VRF-14 12 Ga 5-Shot Shockwave AR ShockStick VRF14

Yes, this firearm will accept the 19rd mag. https://gunprime.com/products/best-price-vr-mag-magazine-mags-19-round-ria-rock-island

The VRF14 is the first semi-automatic short barrel firearm of its kind. It boasts a familiar pistol-style grip so you can shoot 12GA shells from the hip. And if the 5-round magazine isn’t enough, it’s also compatible with VR-Series 9- and 19-round mags. Tempting as it is, don’t just stare at it. Add it to your collection now, while you still can.