Just received my 5.56 MDR conversion that I ordered over 2 years ago lol.... I preordered from Eurooptic and basically had forgotten all about it. I am accustomed to long waits for gear, especially NFA stuff, but this wait was a little extreme.
Had the same problem with mine. Called POF and they instructed me to perform a specific cleaning sequence exactly as outlined in this video:
POF Basic Cleaning - YouTube
I was skeptical (especially the part about the drill), but it has ran like a sewing machine ever since. As a footnote...
I love mine too. Just got a set for my Leupold Mark 6 3-18. Perfect fit. Have a set for a Kahles on backorder. Look forward to getting those soon. And anxious for a set to become available for a USO 1-8.