Ally

Ok thanks everyone, very useful information.

So the middle one always says yfs ?

They are allen head screws. I got the stock supposedly "nib" off gb, about a few months ago.

So I am new here and I have a quick question. On my Benelli m4 collapsible stock it has three screws holding the cheek piece in place. two are black and on it like a grey that says "YFS 010.9" My question is, are all stocks like this? I am worried that someone might have replaced the center screw with a different screw, because it is a different color and has that "YFS" marking on it. The other two screws are black with nothing on them. Anyone out there with a M4 collapsible stock, check out your screws and let me know please. Thanks much