Help identify crosman?

I just got in the mail today I think is a crosman, I bought it off will piatts widow, the ad says crosman .22, is it a modified 2240? I’m by no means a crosman expert, the problem is that .22 pellets won’t load and jam and I have to push them back out, I peeled the camo tape off the receiver to see if there are any markings about caliber and make, nothing on what caliber and only RJ Machine on the other side, I have a tin of .20 cal jsb’s and figured what the heck I’ll try it, they load and shoot, so I assume it’s a .20 cal? Like I said I tried 4 different .22 pellets, different brands too jsb, H&N’s, Hatsan pellets and crosman pellets.. the gun came with a scope and when I took the second shot using the .20’s At a 3” steel target about 40yds away it hit it and with authority! I was shocked I thought this would just be a 20yd plinker.. maybe Will Piatt had this thing hot rodded?

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If it would be a .20 Cal then .22 pellets would not be possible to chamber... I think...
Ya I figured that, the ad said it was a .22 when I bought it but no .22 pellets will chamber in it, luckily I had a tin of .20’s laying around and I figured I would try it, they went in fine and wasn’t tight chambering the .20’s.. I didn’t even try use a .177 since the .20 went in fine.. did crosman make these in .20? Was hoping someone who knew will piatt will chime in to educate me on what I have here