Posted: 11/26/2014 12:05:44 PM EDT
They aren't kidding about only working with the A2 FSB 
But it'll be a quick fix to make work with the YHM folding front sights: 
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Quoted:
I saw your pic in the other thread and was wondering if it would fold. Luckily Magpul polymers cut and file cleanly! How do you like the feel and fit of the SL? I have one on the way for my first pistol build. I like it a lot. The extra length around the front sight is a great feature for me because I have long arms and it allows me couple of extra inches in front of the vertical foregrip. Normally carbine length handguards feel a little cramped but these are great |