Now let me first say I don't know beans about these firearms, so please forgive my ignorance.
But after looking at the Sport, it appears the trigger guard, and grip are all separate pieces, as opposed to one integrated piece as the
Slide Fire piece appears to be.
So, I'm guessing the slide fire unit can't be used on the Sport, despite having the adjustable stock.
I'm hoping I'm wrong and somebody here has tried this piece out and can report back.
I know this is an old post, but better late than never lol. I would highly recommend the Fostech Bump Stock, it's solid metal and not plastic. The plastic will crack over time. Also if you want to keep your AR like new check out my brothers patent. They work amazing.. https://gunsmagazine.com/exclusive-h...cal-solutions/