yes I read the article, It all depends what you are going to do with the gun. For just putting into your hicking bag and going on a trail get the 4" fixed. For long range accuracy and target shooting, go with the target 6". I found that the 6" were hard to zero in quickly for plate shooting (given the distance between the front sight and the rear sight). I think the 4" target would be ideal in all situations. I havn't seen one yet. It will be the hardest to get IMO.