The Aimpoint PRO is known for being a durable red dot sight with great battery life. Guaranteed. Battery is an odd size (1/3N) T2 - Great Unit. The main difference is that the M4’s battery lasts an impressive 8 years on a single AA battery! AIMPOINT - COMPM4/PRO REPLACEMENT BATTERY CAP. We used about 75 of them during the deployment (we received around 45 ACOGs and 45 Comp M4 … Mine had problems with the power rheostat on/off staying at one power setting. So while you are paying more, you are definitely getting a sight that has superior construction. Forever. I zeroed the red dot to the irons I already had on and it was almost right on. 100-018-566WB Replacement Battery Cap CompM4/PRO/ACO. Aimpoint CompM4 Red Dot Reflex Sight with QRP2 Mount, Spacer, Rubber Bikini Lens Covers - 2 MOA - 11972 Up to 80,000 hours (over 8 years) of daytime operation using one AA battery. I thought the original M68s were Comp M2s, we got handed milk crate of them from another unit prior to deployment. Little bit shorter battery life than the Comp M4/M4S, but not by much. I change battery about every six months just because. The lever goes on the opposite side from the battery compartment. Lighter than the Comp M4/M4S. I researched alot before buying it, and the major selling point for me was the outstanding 50,000 hours of battery life on setting 7. umm, and yes red dots are both eye open optics. Call Aimpoint USA for an RMA and send it in. Electronically regulated to allow use of any AA size battery available worldwide. Hey guys, I just ordered a Comp ML3 from G&R, and I'm hoping that it will be here by the end of the week. Has been there since early Oct. Should be hearing back soon. Middle of the road for battery life among the 3 sights. The Comp series sights are the most popular products of the 1974-founded company. The CS rep I spoke to said it was about a 6-9 week turn a round. More variation in mounts compared to the Comp M4/M4S. Have the serial number ready for the CS rep. Me personally I tried out an Eotech a few months back for the first time in years and now I own 2 exps3-0’s. Re: Aimpoint M2, M3, M4s - differences?? According to Aimpoint, the battery (type 2L76 or DL1/3N) will last up to 3 years of continuous use with the optic set on setting 7 out of 10. My Comp M4 is in Sweden right now being repaired. I've had it a couple years now and have never turned it off. 500,000 hours of use on NVD settings with a single AA battery. The Comp M4 was launched in 2007 and the M5 was rolled out one decade later in 2017. On an sbr though I’d rather have one of the micro sized models. Re: aimpoint Comp M4 My M4s came with the spacer that makes it co-witness with the irons. The Aimpoint Comp M4 is the “premium” version of the Aimpoint PRO. Aimpoint AB Is an optics company that specializes in red dot sights. If one were to leave the sight on 24/7, would this cause the electronics in the sight to degrade over time? I think you got the lever on the wrong side brother. I think it’s better than the Aimpoint pro/aco just due to the AA battery. Aimpoint CompM4/PRO/ACO replacement battery cap is a direct replacment for the battery cap that came the your sight from the factory. About 10% wouldn't turn on, had jacked up battery compartment/ covers, missing knobs. Cheapest of the three. Mfr Part: 12221 Add to Cart. Lightest of the 3. They include the Aimpoint Comp M4 vs. M5. the battery compartment got in the way of the larue mount on the M4s?? 500,000 hours of use on NVD settings with a single AA battery yes dots... Battery compartment/ covers, missing knobs on/off staying at one power setting difference is aimpoint comp m4 battery change. Got handed milk crate of them from another unit prior to deployment has been there since early Oct. be! N'T turn on, had jacked up battery compartment/ covers, missing knobs company that specializes in red sights! 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