Most trigger shops list a wall of half-fitting shoes, half of them backordered. We went the other way: one flat-face FRT we can stand behind, kept in stock, with the honest fitment notes on the product page instead of the small print.
This is not a magic drop-in. Some pistols take it in ten minutes, others want a little filing. We say so before you pay. And we say plainly what it is — a semi-automatic component: one trigger pull, one shot.
Flatline is for the shooter who wants a snappier reset without turning a range trip into a gunsmithing project. If you run a Glock, know your way around a punch and a trigger group, and want a shoe that was actually machined rather than poured, this is the one. If you have never opened a Glock trigger, that is fine too — start with the install guide, or hand it to your local smith and shoot it that afternoon.