I don't know.  Something about the band doesn't sit well with me.  It looks like the band is not sliding to the rear all the way over the step on the end of the spring.  I have a carbine stock like that where some chucklehead cut off the stock in the middle of the band and then went "Oh Crapski!" and glued the piece back on.  This sets the spring back just enough to not allow the spring to retain the band.  The difference is the width of a saw blade or just a bit shy of it.

Maybe its just me and my old eyes.



.

---