You said that the #38 and the RAS won't work at the same time. Is this with just the RAS installed or do you mean that it won't work with the panels on as well?
I was thinking about putting one of these on, but if it won't work with my RAS, then forget it. But I recalled someone saying the GG&G scout length F.I.R.E. rail would work and I thought that they were essentially the same (minus the sight).