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 due to the self-regulating function of the piston system. However, if you plan to shoot suppressed often, the IC-E or ICA5 may be better options as they feature an adjustable gas block.