I have 3 currently, the oldest of the lot the .40sw is on loan to the son in law for general house and loved ones protection.
My wife loves the 9mm with a Truglo Red Dot sight.
While I like them all, my favorite is the latest, and the only one bought new, the .45acp.
Like all the others it is equipped with the front handgrip, a decent Red Dot sight.
None of the 3 have ever given me a lick of trouble. I did have one magazine give me some feed issues once. Figured it got dropped full and landed on the feed lips.
2 minutes comparing to the one that worked and a needle nose pliers fixed it.
I do also have the C9 handgun. 100$ pawnshop find. It had a broken magazine release part. So I called the factory, gave the serial #, they said they would send the part right out. It arrived with clear instructions, pictures, a magazine, and a mag loader. All at no cost in 3 days.
Yes I AM a Highpoint Fan. And proud of it.
Do accept that chances are they are not a MOA rifle no matter what you do.
Reasonable accuracy yes. A long barreled Bolt gun they are not.
What they are, is inexpensive, easy to handle, great in close quarters situations, way more accurate than a handgun, and a barrel of fun to shoot. My opinion, YMMV.