While at the Regionals in Roseburg, I got a Tower 40 aluminum backplate, an O.S. NVA, and an O.S. venturi cheap. Today I figured I'd go ahead and convert an O.S. 40 LA to an LA-S with the parts. I have an ARF Nobler that I plan to put together sometime in the not too distant future, and want to put the 40 LA-S in it. I have a choice of three venturis that I can use, two O.S. parts and a delrin venturi. I just used my digital calipers to measure the inner diameter of the three venturis. Which of these three do you think I should throw in the 40?
0.265" Delrin
0.258" O.S.
0.282" O.S.
Mark