It will fit, but I would say that you wouldn't gain all that much by switching from one to the other. The Spike's trigger is reliable and pretty, but anything but smooth and light.
The Spikes is not a real upgrade unless you compare it to the mil-spec triggers most ARs and lower kits come with. and even then it is not as good as any of the ALG triggers.
With a 15-22 I recommend you first buy and install a set of JP "yellow" springs ($10). That will give you about a 3.5# trigger. Unless your shooting skills get to the point where you are shooting things fast enough to lock the trigger up (like 5 targets in under 2 seconds) you will not need more. Or you want to put a SlideFire on it and you need a drop in 3# trigger.