For me it was the Kel-tec Sub2000. I love pistol caliber carbines. I really loved the folding feature of this gun. But the ergos are absolutely terrible. Every time I fired it, it would dislodge my ear pro because of its stock design. You can’t mount an optic on it without expensive after-maker upgrades. It felt like it was made out of cheap pipe. It had to go. I think I lost about $100 on the deal.