The Grenade à Fusil antichar de 58 mm avec piège à balle modèle F1 is a French antitank rifle grenade designed in the late 70s, to be fired from the FAMAS F1 by using a standard ball cartridge.
Equipped with a bullet trap, this may be balle O (Ordinaire, ball) or T (Traçeuse, tracer), US M193 or FN SS92.
The technical specifications are as such:
|Grenade weight||537 grammes|
|Explosive weight (RDX-TNT)||145 grammes|
|Effective range||75 metres|
|Zenith (fired at 75 m)||2 metres|
|Maximum range (fired at an angle of 45 degrees)||319 metres|
|Flight time (fired at 75 m)||1.3 seconds|
|Spread (weapon in a mount, fired at 75 m)||Less than 1.3 metres height plus width|
|250 millimetres of steel at 0 degrees|
|130 millimetres of steel at 60 degrees|
|1 metre of concrecte at 0 degrees|
The AC-58 also served as the basis for the Luchaire WASP 58 mm, a disposable single-shot antitank weapon.
Information is particularly scarce on this system: though Wikipedia claims it had several users, none of this is all too credibly sourced.
The archive of manuals can be found here.