Does the job will require lower modifications - Dark Storm Industries Ambidextrous AR-15 Bolt Catch

grabbed this up after reading reviews, i like the fcat it is not obtuse so ro speak. its just the right size. all that being said (thank you to the reviewer that pointed this out ao i knew what i needed to do) . You will need to clearance about 4mm down on the right side inside the catch slit and you will also need to clearance the lower if its standard above theah release. Can it be done with files and hamd tools ...yes do i recommend that , no i used my mini mill but it can be done with some very careful filing and drilling.