Re: AR spring malfunction
Post a picture of the spring you are referring to. Most sling-mounts mount around the buffer tube and the only little spring you have had to mess with would have been the spring for the the rear take-down pin (if you had to take the buttstock off to install the sling-mount). This problem should be easy to reason out because the AR platform is pretty uncomplicated....but pictures help a lot. All the trigger parts need to be looked at.