Ken, I've had good luck with a gravity-feed conversion gun made by Husky at HD....'bout $70.00. During February I shared some shop space down in NYC with some "crazy high-end" furniture makers....they were using the same gun to shoot clear nitro, thinned to 80%.

I bought mine in a pinch when my Spraytech 9900 done blowed up and was in for service, and so only use it occasionally (that is, I can't vouch for its longevity), but it does give me good results. If it's in the budget, by an inline regulator so you don't have to adjust your pressure at the compressor.

Good luck.