I have a very hard to find complete Gen 1 Marq SC Engine for $150 paypalled and shipped. These do not come along very often, and Bob seems to have stopped making these since I have not seen them in stock in over a year.
Tested and does not leak. Pulling it out of my working gun and putting in a package. I will include some extra orings as a special bonus.
Only Trade would be a stock engine and $120.