I have one, got it a few months back. Because of the weather here, it took me about a month to finish breaking in the barrel. I've now added a Precision Armaments M4-72 compensator, better stock, POF drop-in trigger, UTG rail system, rubberized grip, extended charging handle and, of course, a scope.

My problem is that my first 4 or 5 shots land high, progressively dropping down an inch or two at a time until everything stabilizes. I've come to the conclusion that the barrel needs to warm up first, before being accurate. Once those first 4 or 5 shots have been fired, the rifle shoots sub-moa. Unfortunately, I bought the rifle with the intention of using it as a pig hunting rifle. Which means I don't get to take warm up shots. Any ideas how to fix this? Anyone else having this issue?