If your interested in semi auto training I highly recommend the Gamo PT-85. I picked one up at Wally World for $70 USD. It has a rifled barrel, blowback action, and a 16 round magazine.
It isn't a replica of any particular gun. It has a nice heft to it and fits my hand very well. Single or double action. A slide lock would have been a nice touch, but I guess you can't have it all at this price.
The blowback has a nice kick. The construction is quite good for the money spent.
Performance wise I am getting 2" groupings at ten yards, off hand, using Crosman destroyer pellets. Crosman pointed and Daisy pointed aren't as accurate. Three good mags per cartridge at 70°F. Four at 85°F. I only have one magazine so the CO2 is warming up between loadings. If you shoot through three mags without a rest you will get less shots.
POI is a little left. When I get around to disassembling the gun I am going to look at tightening up the side play in the slide and get the POI centered.
The sights are fixed with white dots. The elevation is correct with the front sight even with the top of the rear. The front dot is higher than the rear dots when sighted. I prefer them to be even.
I have put two 20 cart boxes of CO2 through the gun so far without a problem.
When I bought the gun I also picked up a Crosman airgun holster for $9 USD. It fits the PT-85 perfectly and is made well enough for a carry holster for a firearm.
At .02¢ a shot it will keep me from getting rusty till the 22lr's come back and keep me shooting indoors during the winter.:t
Pic from replica airguns. No affiliation.