While I agree, can't help but think an item such as this, a potentially high powered airgun that's also a rif, should be visible here for the shortest possible time, therefore reducing the chance of someone unsuitable getting their hands on it.
Add to that the seller has been a member since November, but this is his first post, selling something that goes against the rules, which I'm guessing he knew that hence why he clearly points out its NOT AIRSOFT.
I think inconveniencing him by briefly suspending his content until a senior mod reviews it, is far outweighed by the nature of his post & the potential harm it could cause ?.
Fudge it, its hidden, I'm sure the mods will smack my hand if I've overstepped the mark 😢