Bullseye zr sliding mount?

I have one on my TX Mk III and have one coming for my Diana N TEC 350. Once I've shot them a bunch more I will have a real report. The TX is holding tight groups at 25 yds but it isn't even really broken in yet so more shooting is required. The 350 will be a better test for the sliding mount as it has a much more significant jump to it than the TX. We shall see.