The cover fit snugly and should remain in place when you want it to but removes without any problem. Overall I'm satisfied with it.
Great for keeping rain, dust off your HS510C while waiting to shoot. Fit well, snug but still easy on & off. I have 3 in black, all are excellent.
This item was really well made. It fits perfectly over my optic and sits secure enough where it won't fall off when I throw my gun into a bag to take to the range. Definitely worth it for an extra peace of mind.