Confused on ad need identification

[u/Benefit_Waste]

Hey all. Just came across this ad. Can anyone identify this shotgun? I thought it was some .22 at first then i fully read eveything. I have never seen or heard about an “hk15” only one i could think of is the deyra mk12

[u/Horilka]

Kudo to the businesses who still fight this BS some ppl call "government".