The following guns were used in the film The Nest (also known as Nid de guêpes):
Sawn-off double-barreled shotgun
Used by the robber crew.
Mossberg 500
A Mossberg 500 is used by the robber crew. Nasser's main weapon before his injury after which it was given to Nadia.
Bolt-action rifle
A Gaucher magazine-fed bolt-action rifle with a wooden stock. Used by Louis the security guard.
- He loaded it with 12mm shotgun shells.
Smith & Wesson revolver
Louis' revolver.
- Smith & Wesson Model 586. - Gunmaster45
Revolver #2 & #3
Selim and Giovanni's revolvers.
one of em looks like a ruger sp101
FAMAS
The FAMAS is first seen in the hands of French soldiers, later recognized as the main weapon of French commando soldier Laborie.
SIG SG 552
The SG 552 is first seen in the hands of Giovanni, the Italian commando. Later seen in use by both French policemen and the Albanian gangsters.
Steyr AUG
A Steyr AUG is seen in the hands of Winfried, the German commando.
SIG SG 551
The SG 551 was stored in the armory compartment of the APC, later handed out to Santino by Laborie.
Benelli Nova
Winfried kept a shotgun with its stock sawn off in a scabbard on his back. It's either a Benelli Nova, Fabarm SDASS, or something similar. Anyone?
EDIT (John_Ryder): I think it's the Benelli Nova.
It's most definitely the Benelli.
Unidentified semiauto handgun
Laborie's sidearm. Laborie later hands out another one of these to Selim, which he uses to free the prisoner.
That's a Vektor CP-1
Glock 17
Giovanni uses a Glock 17 as his sidearm.
SIG-Sauer P226
A SIG-Sauer P226 with a funky-looking square-shaped suppressor+laser sight attachment is used by one of the Albanian gangsters.
Uzi
Uzis are used by many of the Albanian gangsters, all of them with the same square-shaped suppressor+laser sight attachment to the muzzle as the P226.
Mini Uzi
One of the French policemen in the escort convoy uses a Mini Uzi.
Beretta M12
A Beretta M12 is seen in the hands of an Italian policeman in television footage.