The folks at FEG do some interesting things. Here is a FEG Model 100-S 12 gauge box lock, and its fore end:


The device inset in the body of the fore end is the ‘kicker’ which makes gun a box lock ejector (BLE). But if that assembly is removed:

And the fore end re-installed, the gun becomes a box lock non-ejector (BLNE); an extractor only gun. That’s a nice feature to have. If one is involved in a driven hunt when the birds are coming fast and hard, ejectors are worth their weight in gold. But if we are shooting skeet where it is polite to pick up one’s expended hulls, then extractors are just the ticket.
But the creativity of the folks at FEG doesn’t end there. Here is a FEG 16 gauge SxS:

Note the plunger behind the trigger guard and the absence of a top lever. The plunger does the function of the missing top lever. The fore end of this gun also has the separate ejector assembly:

Here is a top view of the gun, where the absence of a top lever is especially obvious:

Note the push through button just behind the breasts of the standing breech. This button controls whether the safety is automatic (goes to the ‘ON’ position when the action is opened), or manual (remains in whatever position the shooter last set it). Also a nice feature, and allows the hunter to have an automatic safety when in the field, and the clays shooter to have a manual safety that doesn’t crimp his style.
Almost forgot to add: left barrel is choked Cyl, right barrel is choked IM. That's not a typo, front trigger fires an IM bbl, rear trigger fires a Cyl bbl.
Wild stuff.