Word of caution about Holosun Optics....REGISTER YOUR PRODUCT on the Holosun website, even if you bought from Amazon(BOOOOOO!!!!!) I have had 2 Holosun 403b RD crap out on me in the last year, 1 was a Brownell purchase which ended up getting a GC back (fresh out of box failure to adjust) and a second was an amazon purchase which had the records in my account of when I purchased and it was still under the Holosun warranty. I sent it back this past week to holosun after registering it on line. So it is up to Holosun to determine whether it is replaced or what will happen. I spent a good deal of ammo this past summer trying to get it to zero to no avail. Every time i thought i had it, ...nope. Moved on to another rifle and came back to it later.