Originally Posted by kalnaren
This is hearsay, but I've been told the SIG series is an absolute bitch to disassemble. Keep that in mind if you need to swap the spring for something lighter.
Having said that, everyone I know who's owned one loves it.
The good news is that on crazyncman's review video, you can witness this SIG coming apart extremely easily, you just get the handguard off, hold down a button and slide the upper off the lower. The rest looks similar to a G36.
The bad news is that I've never seen nozzles, motor cages, or hopups labelled "for a SIG" so that might be a bit of a pickle down the road.