As far as the prongs are concerned, I don't see it being any less sturdy than any other aluminum buffer tube adapter out there utilizing a pronged design. People have been mounting pretty heavy stocks on those and even used them to house buffers/ springs for the recoil mechanisms on conversion uppers. With that being said, this adapter wouldn't be used to house any sort of recoiling mechanism so I personally don't see it being an issue at all. However, If I could have it my way completely, I'd have a tapped hole for a mounting bolt at the top of the adapter that would allow you to run a bolt through the rear sight to add an additional mounting point. It would be really secure then, but unfortunately, this would interfere with most of the Lage uppers, which wouldn't be worth the compromise.