No with the weapon so big the entire length wouldn't fit Koro. Also evrytime she puts on a weapon it's in Koro's jaw area, going in deeper might not work.
Shot through his leg, and the laser still traveled further, nothing stops it from flying through the main body if she was to shoot there. [You must be registered for see links][You must be registered for see links]. Also remember Seryuu is inside Koro, meaning the laser only has to go halfway through to reach her. Though she can just wait til Seryuu is released to shot her since Seryuu always have to stabilize before actually using nay of those weapons.
Koro constantly carries weapons inside of him. Even something as huge as the number 6 along with various other numbers. It's safe to say that the space inside of Koro's body is rather large. So considering he can swallow up weapons of steel larger than a human, I don't see why he couldn't do the same with a human.
Even in the scan you shown me; the hole wasn't even that big as you can see yourself. Obviously his small leg is less durable than the actual main body considering the main body has tanked a barrage of those shots. Not to mention that she'd have to be put in a pinch from something like Seryu's nukes in order to have that much fire power. And that requires her to actually survive the nukes which isn't even possible here. Even if Seryu had to stabilize herself and then Mine attempted to shoot her, Koro would come in between, tank and then Seryu releases the barrage. Not to mention that she could just use her mouth gun which would force Mine to block it with her gun and leave Seryu out of her aim.
Even in the scan you shown me; the hole wasn't even that big as you can see yourself. Obviously his small leg is less durable than the actual main body considering the main body has tanked a barrage of those shots. Not to mention that she'd have to be put in a pinch from something like Seryu's nukes in order to have that much fire power. And that requires her to actually survive the nukes which isn't even possible here. Even if Seryu had to stabilize herself and then Mine attempted to shoot her, Koro would come in between, tank and then Seryu releases the barrage. Not to mention that she could just use her mouth gun which would force Mine to block it with her gun and leave Seryu out of her aim.