Yes, you would just need a picatinny rail section to attach a grip to the handguard. You can find those here: https://www.opticsplanet.com/nordic-components-picatinny-rails.html
The inside diameter of the Nordic Components NC-1 Free Float Hand Guard is 1 3/4".
The 15in one will.
That depends on what gas block you have.
12.5 is the overall measurement.
The 12in one will.
MPN: FFT-NC1-MID is 9.188" long. MPN: FFT-NC1-RFL is 12.5" long. MPN: FFT-NC1-XL is 15.5" long.
The inside diameter of the Nordic Components NC-1 Free Float Hand Guard is 1 3/4".
No it will not.