U know he can use rubber bullet from ch 4 right? i dont know what caliber it is shown at ch4 but what caliber are most smgs at? even then if he is good with handgun, just use smg at single shot, would be a lot better, faster takedown and more accurate than using handgun, meaning less time to aim, quicker enemy takedown and a lot less chance to miss.
My stance is not that he should dish out bigger gun, it's just that why would he always use handgun for a battle that is a lot more at disadvantages to use handgun for.