Got it! But I was thinking more like 2 mm, not 5 mm. Anyways, I'd try it if it was me, but I'd still keep looking for a more permanent solution.
Maybe you are not familiar with the AR-15 platform, but what I'm saying is that trying it is a waste of time. You could cut the buffer in half and it will still push right up against that post. 2mm... 5mm... 3cm... wont make any difference in as far as stopping it from hitting the post.



















































