The QE shrouds are not very effective at all, I recommend to my customers who want something for their QE guns that they remove the shroud and have me make a standard 1/2 inch x 20 LDC for them. The reports from my customers is that the difference between the shroud and my LDC is substantial and worth every penny. I will not make anything to attach to the shrouds because they are not made to very tight tolerances and they tend to clip when you add something to the end of them, Neil.