The Tasco red dot for $30 ain't bad for a cheap one. The Tru-glo ones seem to work pretty well too.
Guys, if you have taken apart a HP carbine, the rail is held to the sheet metal top cover with a couple screws. The sheet metal cover is held to the action with a couple removable pins. It ain't that precise.
On the other hand, that gun's not a lot of money, terribly fun to shoot, and mine shoots palm sized groups at 25yds with a cheap sight and an operator who's mostly focused on having fun with it.
No need to buy a Ferrari when a Hyundai will get the job done. And leave money for a couple cases of ammo.