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Hello Everyone,

First time posting. I've done my best to check old posts to answer this question, but did not see range results.

With respect to MFI's rear diopter sight and rail, many of you are familiar with the manufacturer's product description, which states:

As I am not a huge believer in the accuracy of the .223 / 5.56mm cartridge so I only fully tested the number 1 position at 100m. The #2, 3 and 4 designations may or may not be applicable. I did position the holes in the correct location, but I did not waste time or funds to test something I do not really believe in. While the #2 and #3 holes are the right size and position the #3/4 position hole is much smaller than the original and is NOT threaded for the insert of a target peep sight, nor is it likely to be at the correct angle as I do not have one to check against. The Diopter walls have not been counter bored on the inside either, so the walls are thick in that area to accept a thread. As I said... The hole is much smaller so that the customer could MILL a new hole at whatever angle they need and make it work. Sorry you are on your own on this one... just not cost effective to test / check 100% when 99% of the customers will never have the money to buy a SIG SANs target peep sight much less have the need to use it.

My questions is, has anyone stretched their rifle out using these sights? After zeroing your rifle at 25/100 meters, what happens when you rotate the rear diopter sight and engage targets at 200, 300, or 400 meters?
 

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Sig556ER; 551 HG; UBR stock w/MDT FSA; MFI rail/rear diopter; 550 FS; Versa-Pod bayo lug mount
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Nobody's used this rear sight passed 100 yards?? I really would really love to hear some feedback on this as well...I have the MFI rear dipopter sight/rail with a 550 front sight on my ER. But my range only goes out to 100yds so I haven't had the chance to try the other elevation settings. It would def give me a nice warm & fuzzy if someone could verify that the specs on the MFI diopter are good enough to the point where hitting a man sized target when set to a specific range isn't a problem. Or, in the case that the holes MFI drilled are jacked up, what mods I would need to do in order to make it reliable past 100yrds.
I promise, if I eventually get a chance to test the MFI rear diopter at 200 or 300yds, I will def post the results here!
 

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Nobody's used this rear sight passed 100 yards?? I really would really love to hear some feedback on this as well...I have the MFI rear dipopter sight/rail with a 550 front sight on my ER. But my range only goes out to 100yds so I haven't had the chance to try the other elevation settings. It would def give me a nice warm & fuzzy if someone could verify that the specs on the MFI diopter are good enough to the point where hitting a man sized target when set to a specific range isn't a problem. Or, in the case that the holes MFI drilled are jacked up, what mods I would need to do in order to make it reliable past 100yrds.
I promise, if I eventually get a chance to test the MFI rear diopter at 200 or 300yds, I will def post the results here!
Did you ever get a chance to try the sight out at longer ranges?
 

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Sig556ER; 551 HG; UBR stock w/MDT FSA; MFI rail/rear diopter; 550 FS; Versa-Pod bayo lug mount
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Did you ever get a chance to try the sight out at longer ranges?
No, I won't be able to till it warns up a little. I'm in NY, so most likely won't be till early spring before I can get to the range that goes out to 200. Plus that'll be the furthest I'll be able try thee sight out. I might be able to go out to 250 if I go into the tree line a lil. Anyway, once I get the chance though, I'll post my results here unless someone else does 1st.
 
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