I haven’t had a quantum but the cutout and clip placement look similar to the overkill I had which has very tight detent. I didn’t mind it but could see it being undesirable.
If you do ship it to Shiro it has to go through R1… if it’s not something obvious it seriously wrong they might fight you on it.
I had a F3, brand new from R1, the detent was so weak I could wrist flick the blade out with very little effort. Unsafe in my opinion and the opposite reason I buy Shiro. They had me send it in and then called me to ridicule me that the knife was “perfect “ after much pushback they refunded me.