AR 15 wedge

Designed this wedge to be a perfect fit for my AR15. It's a little tight but It's supposed to be a set-it-and-forget-it. I no longer have wiggle between my Spikes Tactical lower and my Palmetto upper. I printed it on my Bambu P1s with TPU and 100 percent infill. 

I've tried other models but they would lift away from their position every time I separated the upper from the lower and I would constantly have to reposition it.