I assume you made the change as the SB PDW gave you the length that you were happy with. I currently have the CMMG Rip Brace on mine and usually use it fully extended. By adding the LAW folder, I can just shorten the stock and still have a good length. Did you have any issues with the LAW unit?
TIA
No. My 9mm ran fine with it. I later put it on a pre '13 build that was having cycling problems. Tried everything including LAW removal to no avail. Finally broke down and did a sotar reliability job on the bolt and carrier(only stinking PSA part I ever bought) and the gun runs like a top now! I have the folder if you're interested...