I have both a Huskemaw scope and Nightforce NXS 5.5x22-50mm. I don't have a Mark 4, so no comment. The Huskemaw has been a great scope . I got an accurate load developed for my 7STW and had a turret made with yardage on it. I am however thinking of putting back on the turret that came with it, and making a drop chart based on clicks. More flexibilty that way to make changes due to elevation, BP, ect.
But for 90 % of hunting, this setup is great If money was a concern, I would not hesitate to buy a Huskemaw over the Nightforce. However, having said that,the Nightforce is the best scope I have ever owned. Its repeatability has been flawless, and the glass is great, but it is alittle on the heavy side for a carry rifle. You might want to look at a Sightron S3 also. I have read good things about there glass and repeatabilty. The price is reasonable, and they
are not as heavy as the Nightforce.
But as to your original question, Huskemaw has been a great scope for me, and their customer service has been
outstanding !