Comparing a TM tri-shot to a L96 is like comparing taking apart a car to opening a jar of PB...
There is only a few screws, and if you don't open the cylinder, there is nothing that is under tension or pressure.
Also, if you want to swap the trigger, go with the best:
http://shop.ehobbyasia.com/laylax-ps...l#.U2rrUlfRZNE
NOTE, this does require you to open the cylinder. Still a LOT easier than an AEG or a spring shotgun.