Hey so I was just wondering (this is a really random question) but does anyone know how long the inner barrel of the JLS FN2000 is? I've wanted one for a while and just trade my UMP for a shabby M15 and may sell the parts to buy the JLs, and I want to put in a tightbore but don't know what barrel length to get (this'll be my first time upgrading internals on a gun). Thanks
~C