It doesn't look like the hole isn't wide enough for the plunger to sit correctly.
Factory Part:
Wilson Part:
All videos/images I've seen suggest it's supposed to sit like it does in the first picture. I was able to get the thing in there, but the lever wouldn't turn down (i.e. decock/go on safe). And the firing pin was protruding from the hole in the breech face.
Anyone else experience this? Wilson, if you're listening... care to send me a new part, ASAP?
Thanks.