Hello,
On your 1x7 chrome lined barrel below, which flash hider is permanently attached to bring it up to 16.1 inches?
http://jtdistributing.net/store/more_ar562cl.html
Would you be able to install that onto one of your A-1 uppers? What would that cost if you can?
http://jtdistributing.net/store/more_ar230.html
Thanks!