advantage arms vs tac sol

[mut617]

Anyone familiar with the advantage arms .22 kit for glocks? I wanted to get one and have the barrel threaded until I discovered the tactical solutions .22 kit that I can buy with a barrel already threaded. Problem is they just don't seem able to get them on the market. They are made of steel instead of aluminum like the aa kit to make the weight closer to the stock glock.

Could it be the added weight makes it very difficult for the slide to cycle reliably?