Gritty threads

This block feels solid and durable. However, upon installation I noticed some burrs inside the block that hindered a smooth transition into the barrel. Once this was mitigated, I installed the set screw for gas regulation. The screw stopped as soon as it hit the threads. I felt like I was going to strip it out as I torqued down on this stainless colored screw. Luckily I was to push the gritty threads alone and seat the set screw properly. This is a decent buy however only if it is on sale. My rifle appears to be firing flawlessly as I am using a lightweight bcg. With 200 rounds down range and hopefully more to come.