You should buy the M4 RIS, in the long run it will save you money. If you buy the M4A1 and your looking to convert it to a M4 RIS, yes its possible, however the money that your going to spend to convert it, will probably be the money you could have spent on the M4 RIS or even a bit more.
I had the same dilemna when I bought my M4, in the end I got the M4 RIS and I dont regret it. :P
The ICS version has an ANPEQ on it
http://www.wgcshop.com/pcart/shopper...e41188b0fb2dea
I'm pretty sure the ANPEQ just holds a battery, laser not included. Basically its a replica of a real steel one, most airsoft version its just a large box for you to put your battery in while keeping up with the realism.
All M4's should have retractable stocks unless otherwise stated by the seller or dealer. It looks like the ICS M4 RIS has a LE stock too
