Bought K9 in 2020, Gunbroker listing linked to this forum by a member. FINALLY shot the thing last week. SHOOTS GREAT.

Fired Blazer Brazz 9mm Parabellum 115 grain FMJ. No failures at all, but did have to use slide release lever to chamber first round from next magazine. Can't "slingshot" the slide for reload.

Also: Mag Guts works as advertised.

Lakeland (?) followers also worked great.

All three are suggestions from this site.

Thanks for the suggestions guys.