Anybody tried one of these?

[u/NoGrapefruit1213]

I don’t know how I stumbled upon these but I did. It seems sketchy I’m not sure it’s a good idea but it could solve an issue I’m having with my 10” Ege Levar12s.
So out of my 18” barrel 12 guage using a rifled choke tube I have great accuracy with repurposed target loads with hand made Lee 7/8 slugs but when I toss them in my 10.5 Ege with the same rifled choke it’s all over the map.
My best guess is with the shorter barrel it’s not getting a good enough burn and the blast is sending the slug tumbling? I’m not a ballistics expert. It goes in it goes boom it comes out. What ever else happens in between or after it’s beyond me. So this leads to my 2 questions has anyone tried one? And from what I can tell Lockhart tactical is a legitimate company I can trust?

[u/M3NUTN]

I want 2 of the long ones for my 32" barrel sxs