Thinking of getting rid of the ILS and want to know how "drop in" friendly an Ed Brown is with a springy. If there is fitting that is required, what would that consist of? Also, what spring weight should I get if I keep every other spring stock?

Okay now the "why replace the ILS" question ??  

My GI has the goofy system, it's a fun gun though and not a primary carry piece.    Of course any handgun may be pressed into service and I'm open for suggestions.

I've never locked the system since I've owned it.   Is there anything in there prone to getting stuck or malfunction if you never lock it in the first place?

I took mine out of my  SA GI champion.

Cost about $25 and took 15 minutes.

Trigger is a BIT smoother now(different spring) , and I just FEEL like it's more reliable now.

Quoted: I've never locked the system since I've owned it.   Is there anything in there prone to getting stuck or malfunction if you never lock it in the first place?

You can replace the components with regular ones, and then use a lighter mainspring, and your trigger pull with be lighter and smoother.

My buddy put an S&A mag well in my Kimber once, and he needed to file some of the edges slightly to get everything to work. It was really simple though.

I use the Smith & Alexander Arched Main Spring Housing, make sure you take a rubber band and wrap it around the grip safety before you do take the old MSH out

Quoted: I use the Smith & Alexander Arched Main Spring Housing, make sure you take a rubber band and wrap it around the grip safety before you do take the old MSH out

Why?

Once every 5 or so range outings I detail-strip my 1911...including cleaning the sear, disconnector, and wiping down/relubing the trigger bows. I never had to rubber-band anything on a 1911. Then again, I could probably re-assemble one blindfolded at this point..or at least in a murky room

If you've detail-striped the 1911 before and hate putting the hammer back on with the MSH in place, happy fun tip: Pop the hammer on first. Slide up the MSH until the strut is just about on the plunger (before you can put the pin in), then fit the grip safety..and slide that MSH into place. You can hold it in with one hand and start the MSH retaining pin easily. Makes re-assembly a snap. Biggest PITA is lining up the sear and disconnector holes..

Yes, I get dorky when it comes to taking things apart and putting 'em back together...