{"product_id":"aim-o-m21-self-illuminated-reflex-red-dot-sight","title":"AIM-O M21 Self-Illuminated Reflex Red Dot Sight","description":"\u003cdiv style=\"background:#edfaf1;border-left:4px solid #27ae60;padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 16px;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#1a6b3a;\"\u003eAIM-O M21 Self-Illuminated Reflex Red Dot Sight — it sets its own brightness, so there is no switch to get wrong between a bright field and a dark room.\u003c\/strong\u003e A 30 mm lens at 160 g, on a pair of LR44 cells.\n\u003c\/div\u003e\u003cp\u003eEvery manual brightness control has the same failure: you set it in the safe zone for the light you are standing in, then walk into a building and the dot is a flare that washes out the target, or step into sunshine and it vanishes. You notice in the second that matters and you adjust it in the second after that.\u003c\/p\u003e\u003cp\u003eThis one measures the ambient light and sets itself. Walk from a treeline into an open field and the dot follows, which removes a decision from a moment when you have no attention to spare for it. AIM-O also publish the reticle as designed to stay visible across conditions rather than tuned for one.\u003c\/p\u003e\u003cp\u003eThe body carries the same angled geometry as the DP Pro — sloped faces that take a hit sideways and keep mechanical stress out of the lens seat. It is aluminium, 160 g, with a 30 mm lens and a rubber dot cover in the box.\u003c\/p\u003e\u003cp\u003ePower is two LR44 button cells, with the auto-lighting running off the same pair. It clamps to a 20 mm rail and the published body size is 4.5 x 2 x 2.8 inches including packaging.\u003c\/p\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eSpecifications\u003c\/h2\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13px;margin:0 0 18px;\"\u003e\n\u003ctr style=\"background:#1B3A6B;color:#fff;\"\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eM21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMagnification\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e1x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDot colour\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eRed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eIllumination\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAuto-lighting, adapts to ambient light\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eLens diameter\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e160 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBattery\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e2x LR44\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSupplied with\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eRubber dot cover\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eLenses\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAnti-reflective, multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSealing\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eWeather resistant and anti-fog\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMount\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eStandard 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eGood to know before you buy\u003c\/h2\u003e\u003cp\u003eAutomatic brightness is a feature, not a setting. If you specifically want to dial a dot down to the lowest possible level for a night game, a manual sight gives you that control and this does not.\u003c\/p\u003e\u003cp\u003eLR44 cells are cheap and everywhere, but they are smaller than a CR2032 and will not run as long. Keep a spare pair in the bag.\u003c\/p\u003e\u003cp\u003eAIM-O list the batteries as supplied with the sight. Our supplier does not confirm it either way, so plan on buying a pair.\u003c\/p\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow does the automatic brightness work?\u003c\/strong\u003e\u003cbr\u003eA sensor reads the light falling on the sight and sets the dot to match. Moving from shade into sun, or outdoors to indoors, happens without you touching anything.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I override it?\u003c\/strong\u003e\u003cbr\u003eNo. The point of this pattern is that there is nothing to set, which is the trade you are making against a manual sight.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a 30 mm lens big?\u003c\/strong\u003e\u003cbr\u003eIt is middling — wider than a micro red dot and narrower than the LCO pattern. On a rifle it is a comfortable window without the weight of the big bodies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it come with batteries?\u003c\/strong\u003e\u003cbr\u003eAIM-O say yes and our supplier does not say. Buy a pair of LR44 cells with it and you will not be caught out.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there a tan one?\u003c\/strong\u003e\u003cbr\u003eThe spec sheet covers two finishes, and only the black is on our supplier’s list at the moment. Ask us and we will see what can be brought in.\u003c\/p\u003e\u003cdiv style=\"background:#1B3A6B;color:#fff;padding:12px 16px;border-radius:6px;margin:18px 0 0;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#fff;\"\u003e💡 Titan Forge Airsoft tip:\u003c\/strong\u003e One less thing to set in a hurry. Compare it against the manual-brightness patterns in \u003ca href=\"\/collections\/sights-optics\" style=\"color:#cdd6f4;\"\u003esights and optics\u003c\/a\u003e before you decide.\n\u003c\/div\u003e","brand":"Aim-O","offers":[{"title":"Black","offer_id":55737152078200,"sku":"50023884","price":103.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/AIM-OM21Self-IlluminatedRedDot_TitanForgeAirsoft-1.webp?v=1794498685","url":"https:\/\/www.titanforgeairsoft.com\/products\/aim-o-m21-self-illuminated-reflex-red-dot-sight","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}