My kit i bought in 2023 didn't have a adapter - Ruger 57 1/2-28in Threaded Barrel Kit

Yes I was so happy when I got my ruger 5.7 and loved it and I have always wanted a freaking suppressor so in late 2023 a week after I bought the gun I couldn't afford a suppressor so I ordered a the cost 225 barrel from ruger so I knew it was right so last month I finally got a chance to buy one and got it yesterday and unscrewed the cab off and my 1/2 in suppressor wouldn't fit it so I took it to the biggest gun store in ridgeland and the build bad guns too he said he may have an adapter after 30 minutes in the back came out and said he didn't have one and I can't find one I want to know how my kit came with a cap that was a 10mm and did have the 10mm to 1/2in adapter and half inch cap that's not right and yes I still have the receipt