The IC SPR variant utilizes the same Cold Hammer Forged, spiral fluted barrel as the IC Enhanced. The SPR employs a low profile fixed gas block for the piston system and a longer 12 inch user-configurable, modular rail system. Topped with our low profile Skirmish Sights, the IC line of rifles is the latest evolution in the LWRCI 5.56 rifle. The IC-SPR is our flagship and most popular model. This is a great all-around 5.56 rifle that utilizes LWRC’s most popular features; fluted barrel, ambi controls, and SPR modular rail system. The IC-SPR can be fired suppressed. If you plan to shoot suppressed often, the IC-E may be a better option as it has an adjustable gas block.