The ROMEO4T-PRO is nearly identical to the 4XT-PRO, but instead of the low-slung AAA battery, the 4T-PRO runs off of a standard CR2032 coin cell. This smaller battery offers a slimmer optic body and a small amount of weight savings while maintaining a 50,000-hour battery life.

BCM and Magpul make two of our favorite rail cover options. The Magpul covers feature an aggressive texture and a secure two-piece design that offers a little more standoff from the rail surface.

The BCM rail covers provide a lower-profile design that can easily be moved and trimmed to fit around various accessories and setups. The surface texture adds some grip, but is less aggressive than the Magpul covers.