None of the following pertains to the Jennings in the OP, but cheap .22 pistols in general, perhaps. Sorry if I'm off topic a bit.
Well, crap is crap and anything zinc isn't high quality. LOL But, having said that, the little HP22 has its uses. I would NOT carry this thing as self defense! I like inexpensive guns, carry a Kel Tec a lot, but even
I have my standards. LOL But, the accuracy of the thing astounds me. I cannot understand how a gun with a barrel that rattles around like the clapper in a bell can be so bloomin' accurate. It defies physics.
The accuracy of the gun gives it uses, though, and I like the hammer fired aspects of it. I even gave it a nice trigger job, fairly easy for the home smithing hack. Trigger is nice, now. I've yet to find a gun with this sort of accuracy that's this small. When I do find a steel one or aluminum alloy (with no zinc), I'll consider dumping the HP. The thing seems pretty reliable, too, probably would be even more reliable in .25ACP. I've owned crappier guns in .25ACP that were 100 percent reliable. .22LR really was never ment for small auto pistols. It feeds 'em well, though.
I had this thing with me fishing a 42 acre tank on a hunting/fishing club I was in once. This tank was full of water snakes. I had plenty of Federal on me, so I started shootin' 'em. I was hitting out to 25 yards on 'em, amazing. I bet I killed a dozen in one afternoon. This one crawled up on a limb, looked 3 " in diameter, BIG water snake. None of these were moccasins, just water snakes and they can be aggressive. I could see this one's body on that limb, about 20 yards. So I shot and rolled him off that limb. He started swimming toward the boat, head came out of the water a good 2 feet and I'm in a 10 ft flat bottom with 8" of gunnel, maybe. LOL He was weaving toward me, me shooting at his head. I fired probably 6 or 7 times at his head as he weaved. He got within 15 feet of me and I connected with his head. I was getting ready to pick up the paddle and go hand to hand. LOL!
That's the sort of thing I like this HP22 for, to have along when carrying my 4" small frame Rossi 511 revolver isn't convenient. I don't like IWB too much. I have taken to bringing it along in a fanny pack, though, on fishing trips. It's all stainless and very accurate. But, the little HP fits a pocket. It cracked the slide right after I got it, sent it in, had a new slide inside 2 weeks in the mail box with two spare mags for my troubles. Seems they redesigned a problem with it. Only problem I've had with it since is those recoil springs.
I don't know if the Jennings is as accurate, highly doubt it, and I doubt it is as reliable aas the same gun would be in .25ACP. But, if you like it, go for it. Just realize everything about that gun is CHEAP, no, not "inexpensive"....CHEAP is the word. LOL! That don't mean you shouldn't enjoy it if you find virtue in it, just realize its limitations and replace those springs when they go limp, nature of the beast. I hang on to that HP.22, but yeah, it's a cheap POS. ROFL! I ain't gonna deny that even though I have uses for the gun and even kinda like it.
I have my Rossi revolver which SOME folks think is a cheap POS. I don't, not considering how it shoots and how it's built. I have a Ruger Mk2 and several other odd rimfires. Some are very accurate, most of 'em a little more accurate than the HP22, but none of 'em combine good accuracy with pocket size. That's what endears me to this, my only zinc gun.