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I couldnt find enough feedback on it, so I ended up getting the Bushnell AR Optics Advanced micro red dot for my Glock 40 in 10mm. I'd put that optic on the same plane as the Vortex Viper, but without the lifetime warranty Vortex has.
Thanks for the reply!
I've been looking into the vortex venom, but then came across the bushnell first strike. I'll have a look into the bushnell advanced micro.
I've got a first strike , works well came with a 1" riser for AR's also can be mounted on pistols. Not sure if it would hold up on a 308 although they rate it for shotgun, I had it on a 357 rifle