Leatherman makes some truly great products. The MUT Multi-tool is no exception, either. Snagging a ultra-high 4.6/5 stars from over 365 reviews, the multi-tool has some classic features as well as firearm maintenance tools.
For starters, it has 16 different tools. You've got all the classics like pliers, tweezers and saw, as well as some uncommon functions like a firearm disassembly punch. The screwdriver bits are sized for standard sighting work.
The best part: each tool can be opened and operated with only one hand.