It's a quill -> ahead adapter ...
Tall stack stem was slippy with just bolts, so it's for added security with top cap but also to avoid any head / stem / apple core scenarios
As TvH says, lack of steerer (extension) length concerns me.
I had to choose a shorter height for my Gas Pipe stem so the steerer would reach the top as per advice in the thread.
Well, did chat briefly to Sam about this and he wasn't concerned. Points taken though.
@M_V started
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It's a quill -> ahead adapter ...
Tall stack stem was slippy with just bolts, so it's for added security with top cap but also to avoid any head / stem / apple core scenarios