I decided I wanted to try a red dot sight on one of my MKIV,s. I enjoy shooting with open sights but my son just purchased a MKIV lite and said he was going to put a red dot on it. I didn't want to spend a lot on money so after reading some reviews I purchased a Feyachi RS-29 reflex sight. Cost was $40 bucks. I mounted it on my MKIV 22/45 Lite. Took it to the range the other day and I must say that I was pleasantly surprised with the clarity of the red dot and the quality of it. Shot 300+ rds and it held zero. The dot was precise and crystal clear. If your looking for an inexpensive red dot sight you will not go wrong with this one.