the Bushnell TRS-25 is the best bang for your Red dot buck out there. I have 6 of them and they all work perfectly.
They are worth way more than they cost and most of mine were in the <$90 range.
I have them on all my Carbines and a couple of bolt guns as well.
The parallax thing is a non issue and doesn't affect the usability of this sight one iota. if you are looking at the dot and it is not round, your eye is not in line with the sight. The parallax generated by this eye positioning amounts to less than 1" offset at 100 yards in the most extreme cases.
I have only had one of mine kill the battery and that' because I left it turned on. I carry extra batteries in all my gun cases that have these sights or any other sight that uses a battery. It's simple fix.
Unless your life depends on this sight (buy an Aim Point for $700) otherwise these are as good or better than anything out there less than $200 and for most normal usage will prove their worth.
If you go to places like Midway , Optics Planet and others and look at the reviews they generally have 500+ reviews and still have a 4.8+/5 rating. That shows that the product is pretty good.
Here's a pic of my most recent one. It has about 800 rounds fired so far and hasn't moved since I sighted it in at installation. I can hit a 9" round steel plate at 200 yards every single time off a rest with this gun and any of my other carbines as well. Maybe not the Sub 2000 but all the .223's and .308's for sure.
Kel-Tec SU16, Mini 14, AR, SCR, Kel-Tec Sub 2000, Ruger Scout, Ruger 10/22, and I have installed several of mine on other guns like a Marlin .45-70, and .44 mag and a .35-303 I'm building. They were only removed to install Lyman Receiver Sights after they were finally found and bought. All those were used and cost twice as much as the red dots
Randy
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