The SBA3 from SB Tactical is an excellent piece of gear. It works really, really well as is but… If you really tighten down the arm strap in order to stiffen the forearm wings, the two wings can collapse on themselves which makes everything feel a bit mushy against the shoulder.
The new SBA3 SplitFix is designed to correct that. It is a replacement strap for the SBA3 that includes a keeper that wraps over the space between the forearm wings. This effectively binds them together so that the SBA3 can remain more rigid and keep it shape.
Check out the SBA3 SplitFix at Lunar Concepts.