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I'm sure I'll get laughed at, but someone I used to work with gave me a Crossman red dot from a Canadian Tire air pistol, I've had that on a 22 for about 10 years now and it's pretty good. I keep thinking I should buy a TRS25 to upgrade it, but so far I haven't had any reason to. I tools exactly like one sold under the Millet brand name for way more money, likely made in China for lots of different companies.