I got a hooded reduced .420 with lens from Art over at SS, and playing around with it I'm really liking it.Bought a MISO lens for my match prepped M1 Garand. The product was well packed and the contents matched the descriptions on line. The printed instructions are clear and simple but there are on-line videos too if needed.
Installation hit a snag right away when it became evident that the plastic retaining ring was too small for my hood. The ring did fit correctly in my M1A and in another spare hood, so I can only assume the ID of my hood is oversized. Apparently in the early versions of the MISO an "O" ring was used instead of the plastic ring so I went to the hardware store and picked up a #78 O ring. This still had to be modified by using a dremmel tool to reduce the OD a little, but in the end it works perfect. Off to the range for 200 yard testing.
My Garand hood is .0595 and my M1A is .0520 so I took both for comparison of sight picture. In both cases I have glasses that correct my distance vision. Thankfully it was a perfect day for this test because of bright sun and broken heavy clouds passing quickly allowing me to see in high and low light conditions just minutes apart. In bright light the MISO sight picture was on par with the .0520 but I could hold focus longer with the MISO (seemingly less eye strain). In low light, the MISO was noticeably easier to get and hold the sight picture.
The MISO is no miracale device that puts the post and target in "perfect" focus but when combined with corrected distance I can hold focus on the post better and the bull is still sharper than without the lens. Fuzzy but sharper. Hope that makes sense.
During shooting I did notice a little glare from direct sun over my right shoulder but proper hat placement fixed that. Otherwise you don't even notice that the lens is there while shooting. I do note that my zero moved up 1/2 MOA, probably a result of the improved sight picture.
Last night I swapped sights for a .0520 and put the MISO in that. I think that sould really be an improvement. Experimenting with even smaller or rectangular aperatures may find further improvement. I'll report back on the 520.