Tip:
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Firstly, remove the two hex screws using a 1.5mm hex key...
Remove the original Rear Sight and the flat spring below...
Install the Top Rail and tighten back the two hex screws...
Oops... =="...
Then tighten the three set screws at the top...
Fasten the Top Rail retainer, and use a 2mm hey key to tighten the set screw at the back to lock the Top Rail retainer in place...
The Top Rail is firmly installed... (the wobbling sound actually came from other internal parts...)
To remove the Top Cover, just loosen the set screw at the back and then the Top Rail retainer...
And flip up the Top Rail to remove or install the Top Cover...
Afterward, fasten the Top Rail retainer and tighten the set screw to lock it back again...
The Top Rail works with Top Cover with or without ribs...
Finished! Thanks for watching.