Keep looking elsewhere - Vism 1x 25mm Micro Red/Blue Reflex Dot Sight, w/Integrated Laser, 3 MOA Dot Size

Ordered this item to install on an AR15. Item took over a week to arrive, and the next weekend I get it installed and every 5 to 10 shots, the battery cover comes flying off. Called to return the item, and once installed, they will not accept as a return and you have to have it repaired under warranty. Called the manufacturer to have it replaced (after several phone calls, the warranty person finally showed up to work), and you have to pay the shipping both ways to have it replaced/repaired. Gave 2 stars as it is a cool design, but the machining process is below standards, and replacing or returning has been a complete pain. I will probably not purchase an item made by Vism/NcSTAR again.