I’ve got a 1077, and it is not fun to shoot. I bought it b/c it was semi-auto, but the trigger pull is so bad, that it’s not fun to shoot.
You can’t leave a CO2 cartridge in it, or it will start leaking.
And yes, it’s only pellets. It was ok as far as accuracy, and the price was great. ~60 on Amazon.
Both of those problems are really minor, all things considered. I started with a Crosman pump air rifle and with some minimal mechanical effort those can easily be rectified. Some dissassembly required, however.
First, remove the CO2 cartridge. The receiver can be opened up by removing the three screws holding the two pieces in place.
Trigger pull is caused by the single spring that the metal lever (trigger) compresses. Replace the spring with a more useful one. If you have an old ballpoint pen handy get that one out of the pen and modify it with a pair of needlenose pliers as required even.
The leaking CO2 cartridge is caused by a tiny O-ring in the seating area. This can be carefully removed with some tweezers and then re-seated with some silicone grease for better sealing. As long as the O-ring is not cracked or torn it will work much better. If not, a replacement is in order. Reinstall and check for fit, then reassemble.
Easier than repairing damaged eyeglasses, actually.