Okay, red dot sights came first and are “normal” sized. Normally, these are designed for larger guns like rifles and shotguns. Mini red dot sights are newer to the market and are mostly designed for pistols or to be used alongside other optics on a rifle, such as mounted over an ACOG...
For platform flexibility, theBurris FastFire IIis a good choice. It has a 4 MOA dot reflected on high-grade optical glass. It’s waterproof and heavy-duty, yet very lightweight. The small profile of this red dot makes it suitable for just about any gun. Magnifiers…Because Why No...