Most Springfields, the sole exceptions being the Custom Shop guns, have the ILS.
+1. The Springfield ILS is the one departure from the original design that is easily remedied. Series 80, Schwartz safety, you’re pretty much stuck with them. It’s a small thing to get rid of the ILS and you shouldn’t let it dissuade you from getting the TRP if it is a gun you want.
I have a Springfield that came with the ILS MSH and it never gave me any issues. I just recently replaced the MSH with a non ILS part. Took me about 10 minutes to do the swap.
S&A generally match and look great. The problem is they drill the cross pin hole to fit a wide variety of pistol frames so there may or may not be a gap between the well and the end of the grip.
The SACS orders them without the crosspin hole drilled so they can fit them.
I think if you snag a 2 piece like the Ed-Brown it may be easier to fit.
Never used it on mine, but its never given me a problem either, like everyone else says, easy fix tho, 10-15 min and its gone. You’ll love the gun, get it if you can.
Is there a chance the ILS ‘tumbler’ could rotate inadvertantly and prevent the hammer from operating with GI internals installed? If not answered I will check when I get home and report back.