Yep, I missed that - and it's not there on the eBay housing. Still need to look at my triggers, but know from past examples that the "extra notch" can be deeper on some - but maybe this one has been altered? Also, I'm wondering if the eBay housing has an ordnance bomb on the RH side - can't quite make it out, but maybe lost when reparked. Good thread, Chip! - Bob