Did you get the HW70 or the HW70A? The HW70 has open sights and the HW70A has a rail to mount an optic or red dot. I have a newer HW70A with the safety and I'm still breaking it is, but very enjoyable to shoot.
I also have a much older HW70 without the safety and open sights I purchased used. I had to replace the breech seal - so if you are getting used check that it's in good condition. Trigger is a bit more sensitive on this one.
Haven't really shot for groups, but it's an accurate pistol. As with all springer pistols, if you seat the pellet just a touch into the barrel they seem to shoot more consistently.