Handguards are commonly 7" but sometimes G&G does things differently and it may be longer or shorter by an 1". I remember reading on here that G&G handguards are different so you may have to do a trail and error test. Search around and to confirm what I've said. Good luck.
P.S. To answer your question, any 7" rail should fit but there are all ways fitment issue in airsoft.
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