Aimpoint Acro P-2/C-2 Aluminum Battery Cap Kit, O-Ring & Damper, Black, Battery Cap The Aimpoint Acro Aluminum Battery Cap Kit is a genuine Aimpoint replacement part made for the Acro P-2 and Acro C-2 enclosed red dot sights. The kit includes an aluminum battery cap, an O-ring and a damper, which are the parts that close and seal the battery compartment on these sights. If your cap is lost, damaged, worn from repeated battery changes, or you simply want a spare on hand, this kit restores the compartment to factory condition with parts built to the same standards as the sight itself. The Acro P-2 and C-2 are known for their fully enclosed housings, which keep water, mud, sand, snow and debris away from the emitter and electronics. That sealed design depends on every part of the housing, including the battery cap. A cap that is missing, cracked or no longer seals with a good O-ring leaves the battery compartment exposed. Replacing it with the correct Aimpoint kit keeps the sight working the way it was designed to. Why Choose This Battery Cap Kit Genuine Aimpoint part: designed by Aimpoint as a direct replacement for the Acro P-2 and Acro C-2, so the fit matches the original. Aluminum construction: the cap is machined from aluminum for long-term durability and a precise fit. Complete seal: the included O-ring and damper go with the cap to give a secure seal and dependable performance in demanding conditions. Black finish: the black housing color matches the look of a black Acro sight. Easy to keep in the range bag: a small, inexpensive spare that can save a training day or a duty shift if the original cap goes missing. Kit Contains Aluminum battery cap for the Acro P-2 / Acro C-2 (Aimpoint part 200859, UPC 7350004387267, sold as one kit) O-ring (included in kit 200859; not sold under a separate UPC) Damper (included in kit 200859; not sold under a separate UPC) Built for the Acro Platform The Acro P-2 was designed as a low-profile, fully enclosed red dot for pistols and other applications that need a compact sight, and the Acro C-2 offers the same fully enclosed design. One of the strengths of both sights is that the battery can be changed without removing the optic from its mount or slide, so your zero is not disturbed. The battery cap is what makes that quick change possible. Because it is opened and closed every time you replace the battery, it is the part most likely to wear, get scratched or be dropped and lost during a battery swap at the range. Aimpoint ships the Acro P-2 with a battery cap tool for removing and installing the cap. Take your time when you remove and install the cap, keep the threads clean, and make sure the O-ring sits properly before you tighten it down. A clean, well-seated O-ring is what keeps moisture and dirt out of the compartment. Running an Acro on a duty pistol, a carry gun or a carbine? Explore our selection of red dot and holo sights, including the Aimpoint Acro P-2, and pick up other covers, tools and spare parts in our sight accessories section. When to Replace Your Battery Cap The original cap has been lost or misplaced during a battery change. The cap threads or slot are damaged and the cap no longer tightens or turns cleanly. The O-ring is flattened, cut, dried out or missing and no longer seals. You bought a used Acro and want fresh sealing parts before you trust it. You want a spare cap kit stored in your range bag, vehicle or armory kit. Specifications Manufacturer: Aimpoint Product: Acro Series Aluminum Battery Cap Kit Manufacturer Part Number: 200859 UPC: 7350004387267 Fits: Aimpoint Acro P-2 and Acro C-2 red dot sights Cap Material: Aluminum Color: Black Kit Includes: Battery cap, O-ring and damper Type: Replacement spare part Frequently Asked Questions Which sights does this battery cap fit? Aimpoint designed this kit for the Acro P-2 and Acro C-2 red dot sights. It is a model-specific part, so use it only on those two sights. What comes in the kit? The kit includes one aluminum battery cap, one O-ring and one damper. The battery itself is not included. Is this a genuine Aimpoint part? Yes. This is the Aimpoint spare part 200859, made by Aimpoint for its Acro P-2 and C-2 sights. Do I need to remove my Acro from the gun to install it? No. The Acro P-2 and C-2 are designed so the battery can be changed without removing the sight, and the cap is replaced the same way. Your mount and zero stay in place. Why does the O-ring matter? The O-ring seals the battery compartment. It helps keep water, dust and debris out of the sight, so replacing a worn or damaged O-ring is just as important as replacing the cap. What color is the cap? The cap is black, matching the black housing of a standard Acro sight. Should I keep a spare? Many shooters do. A battery cap is small and easy to drop during a battery change, and a spare kit means a lost cap does not take your optic out of service.