I'd recommend picking up a Primary Arms Micro Dot if you can source one. Cheaper than the Holosun's but still great quality.
If that's still outta your budget, stick w/ a Bushnell TRS-25.
Just avoid clone sights like everyone else said, it won't last long on anything w/ recoil (asides from a few Comp M2 clones).
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Just your friendly neighborhood narcissist gearwhore.
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