Hi all, could use some red dot recommendations for my 22/45 MKIV Lite. I'm 70 yrs old and on social security so I don't have a ton of money. I would like to keep it at no more than $300 all in. I would prefer to use the stock rail if possible. I usually shoot standing at a max of 15 yds with a 2 1/2 in circle. Any help would be greatly appreciated. This will be a 1st time venture for me. Thanks!