Seems the plan has changed for the better. While researching trying to find a JAC AR-18, I found a message board specifically dealing with classic and discontinued airsoft weapons and decided to ask for assistance in locating one. I was referred to a particular member there who apparently has an excellent track record in locating rare items such as the AR-18, so I wrote him a message asking for assistance and received a reply from him this morning informing me that in a week or so he could have one for me to purchase. He mentioned a non-functional one would be much quicker to locate and make a serious difference in the price which was awesome considering what I'm acquiring it for. So I cancelled the SIG 550 and should have an actual AR-18 airsoft in a week or two. Pictures to follow.
Also for anyone who is searching or know's someone searching for a classic/discontinued airsoft gun, I recommend going to Classicairsoft.net and asking for help. I got assistance from the members very quickly.