It depends. If it's a rail made for airsoft by an airsoft manufacturer, it should be fine. If it's meant for a real AR, no, it wont fit.
Airsoft handguards are much thinner than real ones, and the screws will not be able to tighten the rail on as the nuts are too thick.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.