The Tactical RIS Handguard (Medium) is made out of aircraft aluminum. It is solid in construction and made to last. This is the medium lenght version, and best for M4 and M16 style rifle. The best barrel lenght for this handguard is 10 inches to 14 inches barrel.
The Tactical RIS Handguard (Short) is compatible with all barrels and paintball guns. Handguard Length: 6.5 Inches
For this handguard to properly fit on your barrel, you need to select the right
barrel barrel nut adapter. There are 4 sizes of barrel nut 9/16, 7/8, 1 inch and 1 1/32 inch. Most markers are 1 inch (Tippmann, BT, T68). You can identify your barrel size by measuring it the base section of the barrel.