Sorry it's taken so long to get back to you, we've been pretty busy with events recently.
Whereas chrome lining is available on any of our AP4, HBAR, or military profile barrels, it is standard on all our barrels under 16". This is because those barrels are almost always being used on NFA short barrel or full autos where this is desired. Your 14.5 barrel should be chrome lined through and through.
Any questions, let me know