Daniel Defense’s rails are designed and manufactured to meet the most demanding requirements of the battlefield. Using a super strong, proprietary high-temperature alloy, the barrels feature an uninterrupted top rail made for mounting iron sights or optics. The extremely smooth upper receiver is optimized for use with scopes as well as red dot optics. The Daniel Defense rail system is best of breed, offering the least amount of rail space intrusion, increased structural integrity, superior weight savings and perfect attachment points for the MLOK accessories that shooters want most. These rails are available in various lengths and configurations, so you can choose exactly how you want your weapon to function.