Mine is a Bushnell that I spent about $60.00 on. I think the dot is 4 moa, but could be 6, not sure right now. It is a light weight, compact affair, that uses standard 1 inch scope rings. The intensity of the dot is adjustable from 1-10, so you get good aqusistion of the dot in different lighting conditions. I happen to find it very useful during dusk, or overcast rainy days. BTW, during rain is my favorite time to hunt the "hairy tailed tree rat" :-)
I bought this sight to use on a Walther G22 bullpup. I was more impressed with the sights than the gun. When I traded the gun, I kept the sight system and used it on my old trusty 10/22, replacing a Williams peep sight that had been on the gun for 15 years!
Now, if I where going for absolute precision, I would use a high powered optical sight, say, a 3x9, or 4x12. Most of my squirrel hunting is in dense woods and shots are seldom over 50 yards, most are inside 100 feet, ideal for the red -dot sighting system.
Keep your powder dry, Scott