Supposedly you can adjust the front sights with just a cartridge, but anyone who spends enough time at the range is likely to opt for a tool to do the job. Our front sight tool is superior to the others on the market because it features a fluted shaft which gives light weight and superior handling, a philips type driver for adjusting accessory optics, and a lanyard hole. We know infantrymen who wear this tool on a chain 24/7. We guarantee it for life.