BudsGunShop.com - Red dot

James, No, the Fast Fire red dots cannot be mounted to the Hellcat OSP. ----- gunsholstersandgear.com/2020/08/01/what-optics-will-fit-the-springfield-armory-hellcat/

No, this will fit these red dots. Shield RMS,
Shield RMSc,
Shield RMSw,
Shield SMS,
Sig Sauer Romeo Zero,
Leupold Delta Point Pro,
JP Enterprises JPoint,
ADE Advanced Optics RD3-018 Spike,
ADE Advanced Optics RD3-021 Nuwa,
Swampfox Sentinel 1×16, and
Vector Optics Frenzy-S 1x17x24 MIC. Sorry but hope this helps.

I dont think so "As this is written, Shield Sights (RMSc) and JP Enterprises (JPoint) are the sources for optical sights small enough to be compatible with the diminutive pistol."