13MPG

I have used them on several rifles with Aimpoint H1s/T1s with no issue. I think that the quality of the optic is going to come into play big time here as some of the lower end stuff might not be able to take the heat. Buy once, cry once kinda thing. Right now my SGL21 has a T1 on it and I am waiting on my SLR-107F to show up and it will have a H1 on it. For whatever it's worth I have never used a vented Ultimak on any of my rifles (7.62, 5.45, 5.56).

Kinda funny that I found this thread… As a long time AK owner I just found myself in the same situation. I just picked up a NIB SGL21 from a friend on mine a few months ago. I have several Arsenals but this is my first Saiga. After putting a couple hundred rounds of Wolf through it over a couple of weeks I noticed an odd hue to the brake. On closer inspection there was a ton of crud on it. When I tried to take the brake off the darn thing was locked on. A couple of hours later after soaking the front end in oil I was able to get the brake off. The front of the FSB and barrel w