This Tacitcal RIS Handguard is made to be compatible with the stock barrel of US Army Alpha Black and US Army Project Salvo. It's easy to install and made of aircraft aluminum.
Middle Handguard Length: 4.5" Inches
Other Available Options:
Short Handguard Lenght: 4.5" inches
Middle Handguard Length: 6" Inches
Long Handguard Length: 10" Inches