Bought an ATN 4k Pro and the ABL 1000 and there is really no scope covers available that aren't a neoprene sock so took a crack at making my own. I had made a couple of duct tape wonders in the meantime but had also played with aperture sizes for the front objective to allow for more contrast in the daytime. Ended up settling on a 1/2' aperture. Let me know if you have any questions or would like the STL files. I sent mine out to Shapeways for printing for around $50. Your mileage may vary. I made the housing a little over sized and foam lined it for a tight fit. Everything else was zero clearance so that I could hand fit.