Re: trouble with a grendel upper!!
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gotta/start/sumwer</div><div class="ubbcode-body">I bought me a grendel, and the upper was built and the lower is a alexander arms with a prs stock. Twice while shooting the bolt seems to knock the nipple out, that holds my buffer tube back causing my buffer tube to hold the bolt closed. I cant think of what might cause this so im looking for help from you guys!!! </div></div>
By "nipple" im assuming you mean the buffer retainer? Is it knocking the tip off the buffer retainer or is it just popping out?