Bell Helmet Shield Pivot Mechanisms
How to identify which shield pivot mechanism is used on your Bell Helmet.
Bell introduced the SRV friction-lock system as a rolling production change in 2005-06 on the SA2005 Dominator, Vortex, M3 / M3 Xtra, GTX, M4 Pro, and BR-1 helmets. Some of the early SA05 helmets have the original Kam-Lok detent system, but later SA05 versions of these models have the SRV system. The SRV shield has a smooth curved slot in front of the pivot and takes a different shield.
If your shield goes "click-click" when you raise it, you have a Kam-Lok shield.