> An ND or malfunction will kill or critically maim you
> Limits barrel length and effectiveness of the weapon (appendix carry is the only reason why barrels shorter than 4" exist on non-pocket pistols).
> Promotes bad lifting and squatting form by putting an obstruction right at your hinge point. Leads to back and knee problems.
> Uncomfortable while seated and probably interferes with digestion.
> Doesn't increase draw speed anywhere near enough to actually make any difference for any kind of real world situation.
> Flashes when you raise your arms.
There is no reason to carry a gun this way.