Originally Posted by GaryS

I *think* it is TDA, but I'm not 100% sure. It's part of a small bunch of 3rd Gen internal parts I bought. The ad said 4003, 4006, 4046, so who knows?

The hint that makes me think it's TDA is that in the same bunch there are a Ejector/Magazine Depressor, Firing Pin Safety Lever, and Sear Release Lever. I don't think that the DAO guns have the Sear Release Lever, but have a spacer instead.

I'll just post a picture when the parts arrive and post it here. That's if Mercs is interested.