Wow, you young guys are lucky you were not around for the first Grendel .380's. Bought one from a fellow cop in 1990 as a backup. 10 rounds of .380 in a light package, top loading fixed mag. Trigger was so ridiculously heavy you could not hit a 6" plate past 5 yards. No way to stage the trigger either. I sold that sucker to a lawyer as soon as I could.
Worst gun I have ever owned, hands down, was the Grendel. I bought it in working condition, though I never could fire a round out of it. After taking a half hour to load the dang thing (does not have a removable mag, loads through the top of the slide) I took it out to shoot it. All went well until the firing pin struck the primer. Nothing. Double-Strike capabilities, okay. Nothing, again.
So I tried a second round. Nothing.... Nothing... The firing pin would NOT strike hard enough to fire the round.
I took the gun apart to realize the real problem. The inside of the Grendel is an absolute mess. It's like trying to make sense of a pot of spaghetti. After hours of cleaning and sorting, and prying, and sweating, and screaming I FINALLY managed to jam every clean part back into the gun like it came out. Confident, I went to try again...... Nothing.
Never fired a single round from it. Sold it, will forever pretend that I spent money on this gun.
If you may come across one, please empathize with the terror and heartache it caused me, and just pass by it, silently... but aware of its evil.
KelTec PF9 Hated that gun.
Argentina made 1911 .45 (dont recall the brand) jammed every shot unless you were shooting FMJ.