After much looking,reading, listening about red dots for the Hellcat, I decided on going with the Shield Smsc. Called Springfield and ordered one. It came quickly, no tax no shipping. After a call back to Springfield re: mounting, I installed it and it fits like a glove. Small and compact. I have one of those laser bullets and lite up targets, it was pretty much on. 6-8 clicks wind and elev and right on at 10 yds. Haven’t shot it yet, probably this Thursday at range. It comes with a 1 deg shim for other pistols. Not used on Hellcat. I’ll write again after I Shoot few hundred rnds to see how it holds up.