The barrel ships with a Noveske low profile gas block and midlength gas tube. This barrel is designed for our (Noveske) gas block that is 1" long (INCLUDED). A standard front sight base is 1.9" long and WILL NOT FIT. Barrel installation should be performed by a qualified gunsmith. Installation of the gas block dowel pin and gas block is required to complete the assembly process. 

All NFA Regulations apply. Please check your local and state laws before ordering. 

Contact your local ATF Field Office with any NFA questions you may have.

Link to parts manufacturer