if you mean "race gun" as pistol with rds and comp the biggest issue would be finding a holster. Even if you did miraculously find a large enough holster, race guns often have extended mag releases which a soft holster would engage constantly. Ipsc holsters (the ones that go into barrel and hold on to trigger gaurd) I dont know much about but dont look like they do much in terms of protection.
Unless you plan to run pistol only in which case that would be fine
TM MP5k PDW -ris, stubby grip, DNTC, electro
KWA USP 45
"SNIPER" is NOT a gun. It is a person. Saying "I use a sniper" is like saying "I fly a pilot".