Here is example

The nose is considered a tackle and the 3-tech is considered a tackle. So, there are two tackles and on down linemen end.

Technially, depending om the shift one of the OLBers is the other "end" Sometimes it will be Quinn, other times is will be Barwin. But both are standing up, so that is the feature of the one-gap 3-4 it is a 4-3 with one of the DEs standing up.