The Firearm Blog | Costa’s Gat Swag: Kalashnikov USA KR-9 AK Short Barreled Rifle


Posted December 23, 2019 by Alex C

Welcome to Costa’s Gat Swag. A monthly installment of some subgun, SBR, or SBS that I have built or bought. I have an addiction to shorties. I love versatile PDW setups, and I am here to share some of my favorite builds. Meet the KR-9 9mm AK SBR with Zenitco handguard, hand stop and IR/Vis laser. Equipped with a cute little 9mm can and optic. A fun blaster and quickly becoming one of my favorite pistol caliber sub guns.


Out of the gate, the KR-9 is a fantastic little AK package. It comes with a neat little muzzle brake that’s great for unsuppressed shooting and a grip that needed to be changed desperately. The brake ended up in the bin of forgotten gun parts because we suppress everything. The KR-9 is a blowback gun. It does have the cantilever arm where the piston would be inserted and pinned into. The arm is cut short and there is no piston. With that being said, with a suppressor, it is slightly gassy. You are not having the gases escape at the gas block, instead escaping back into the receiver. It’s not all that terrible, but something to note.

The factory trigger on the KR-9 is also decent. It’s a Tapco G2. If you are familiar with doing an AK trigger job, the KR-9 is fantastic for that. I polished and reduced the contact surfaces on the hammer and the disconnect. It feels much slicker than a standard AK trigger thought. The trigger functions much like the ALG lightning trigger, but much safer. I will not ever switch this trigger out. It’s only getting better with time. I run ALG lightning triggers on my 5.45x39mm guns but never recommend to new shooters.

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