What I used in competition for several years was an old Gilmore red dot with a 2.5x lense that screwed onto the front. They stopped making the lense but every now and then one pops up for sale. The Gilmore has a 2 MOA dot in it for rifles. Now Gilmore is Gilmore Leupold or Vis Versa as Leupold bought them out. I still have two of the sights, bought the last one while walking around a gun show. A guy had come in and walked all over the show trying to sell it and no one at that show knew what a Gilmore was, he about fell out when I said what do you want for that Gilmore as he walked by, so I bought it cheap.
They are great foe a coal burner. 
Ed
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The three Rs: Respect for self; Respect for others; and responsibility for all your actions.
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, almighty God! I know not what course others may take, but as for me, give me liberty, or give me death!"
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