Noel, There is not an automatic last round bolt hold open on this firearm, but it has selector lever notch to hold open bolt. Saiga magazines and MKM 1919 10 round magazines should fit and function.

I don't think the first reply is correct. In the link provided by a member actually states that this shotgun does NOT have "last round Hold open"

Noel, yes it has "Last Round Hold Open". According to this article you can get original mags here and Saiga Mags should fit : thetruthaboutguns.com/2019/06/jon-wayne-taylor/gun-review-kalashnikov-usa-ks12-and-ks12t/

Kalashnikov Usa KS-12 KS12TSFS

Name: Kalashnikov Usa KS-12 KS12TSFS
SKU: 47689

GunCritic Score

Critic Rating

User Rating

0 Reviews

MSRP:

$925.20

Used Price:

$925.20

Sale Price:

$1028.00

Kalashnikov Usa KS-12 KS12TSFS Gun Stats

Kalashnikov Usa KS-12

Guns.com

Old

From $1,048.56

See Deal

Want to Sell Your Gun?

Get Instant Offer

This tactical shotgun features a 10-round magazine, ergonomic pistol grip and a handguard with side picatinny rails. Specifications: Weight: 8.9 lbs Muzzle: Muzzle Brake Sights: Bead Front, Drift Adjustable Rear Hand: Right