No idea, but at £45 and with a dremmel and some aluminium black you can make anything that gets in the way vanish.
Or you could just be careful when you try to install it so it can go back to the store if needed. At £45 I'd risk it because the G&G one looks to be the same.
I've had older G&G discontinued parts from other companies before, Recently I got some sights for a G&G GR300 and G&G don't make them any more, but the A&K ones are identical to the G&G ones. I can't see G&G making a M14 and changing the layout significantly. You can trawl the forums for an answer, but you might never find one.