After total tear down of SG. Fitting fairly straightforward after one side other side was easy
Used small diameter stone on rotary tool
Worked Great Take a little fit and repeat until good fit

Works as advertised. Installs easily after modification of bridle. The whole job took around 15 minutes. TTN bridle screws threads on my shotgun are pretty crude. Recommend using blue locktite when reinstalling them.

Big improvement over the stock springs.