Larsen's position, in my view, is highly amusing.
Larsen's insistence that guns which "can be used for sniping" (or something else he considers "illegitimate") should be banned because no law-abiding citizen would "really" need them would leave the law-abiding only with the ability to buy single-load, deliberately inaccurate, heavy cr@p guns.
After all, why would a law-abiding person need a particulatly accurate gun? Or need to fire many shots in successions? Or need to have a weapon hidden? Or... and so on.
Of course, gun manufacturers do not (deliberately, anyway) make guns which are inherently inaccurate, slow to fire, difficult to hide, and all those other wonderful qualities that Larsen appears to think are so important for "law-abiding" guns. So in effect his objection, if treated logically, is to say that law-abiding citizens are should not be allowed to own guns--or at least not good guns.
I am reminded of France's defense secretary, at Versailles, objection to the idea that Germany should be allowed "defensive weapons": "whether a weapon is offensive or defensive depends on which side of it you're standing."
Grammaton & others replying to Larsen are looking at guns from the law-abiding owner's side of the gun: they seem them, quite rightly, as defensive in essence even if (God forbid) they have such awful qualities as accurate or repeated fire capability.
Larsen is looking at the same guns from the other side of the barrel and for this reason considers the gun essentially offensive... that is, he looks at the gun from the would-be robber or rapist's point of view.