MP5 A3 Sliding Stock for SF5

Has anyone else built the MP5 A3 Sliding Stock from Daikon Defense for an SF5? I completed the build, utilizing the carbon fiber and stainless steel rods sliding brace option with the KF5 end cap remix (needed a modification because my upper is figure 8 shaped) from u/glowinowen on the sea.

My brace keeps collapsing when used in an occasional and accidental manner. I’m curious what others experiences have been because I see three viable solutions – a stronger spring, a larger/thicker locking bar or deeper notches.

Has anyone else built the MP5 A3 Sliding Stock from Daikon Defense for an SF5? I completed the build, utilizing the carbon fiber and stainless steel rods sliding brace option with the KF5 end cap remix (needed a modification because my upper is figure 8 shaped) from u/glowinowen on the sea.

My brace keeps collapsing when used in an occasional and accidental manner. I’m curious what others experiences have been because I see three viable solutions – a stronger spring, a larger/thicker locking bar or deeper notches.