This quick note will help you and avoid any unnecessary frustration !! - SIG SAUER Romeo 1 Pro 1x30mm Reflex Red Dot Sight

Something so simple, but left out in the instructions. I got the idea to post this from another post, who mentioned about BATTERY INSTALLATION and He was right ! Kudos to him, for sharing this Brilliant insight, Thank You !! When your Ready to install the Battery, PRESS DOWN just A Little Firmly, you will feel it “snap” (for lack of better words) into place, Then the Battery Cap will screw into place EFFORTLESSLY !! Being that it’s made from Aluminum, the cap and body threads are soft and can easily cross thread if you’re not “gingerly” about screwing the cap on. Great heads-up !! Not everyone, is aware of this little, but Giant ~ extra time savings and no frustration suggestion. And if you want, go one step further and turn can backwards (left) just a little, until you feel the cap fall into place with the female threads, then turn back to the right. No need to over tighten the cap, just snug it up, is all that is needed…