To start things off: This is my first build so I am learning everything from the basics to advanced (pls help) and so far so good. I am about to finish but after picking up a new spring from my local shop I now realize my current spring guide (the stock one) is too wide for the spring to fit. The spring I have is a laylax PSS10 170 and I was wondering if there is a spring guide to fit it. I have seen the laylax PSS10 spring guides but am wondering if they are 9mm or 7mm (I need the 7mm). I don't want to buy something I cannot use any info is appreciated.