Hi all, I've got a 590A1 but am starting to develop interest in the 930 SPX (Damn you Mixflip!!!). I read somewhere that the stock for this shotgun (the type that includes the pistol grip) has some sort of "spacers" that allow for some adjustment. Does this "adjustment" include changing the length of pull? I mainly ask b/c I'm a little guy (5'5, 145) and currently use a short Hogue stock on my 590A1, and worry that the stock on the 930 SPX will be uncomfortably long. Thanks!