m4 carrying handle problems, help?

[danm4lnyk]

i have the G&G m4 carbine, with a fully adjustable carrying handle, however at one point i had the rear sight to the extreme left (side opposite knob) and now if try and adjust it back to the right, it say in place and when i turn it further left the knob tightens almost instantly, also a can no longer flip the sights from combat to precision. any ideas on how this could be fixed?

[tehmedic]

just push the sight a to the right while you're setting it to the right i think you might've just adjusted it to the left too much and it reached the end of the threads . and who uses the peep sight anyways lol