The M811 is an automatic, externally powered, single- or dual-fed autocannon firing NATO standard 25mm ammunition, designed by Nexter Systems (previously GIAT Industries).[1]
History
The M811 was first shown in June 1983. Its intended use is in an air defense or direct-fire role, mounted on either naval or land platforms, replacing existing 20 mm cannon where applicable. The Model 811 has been installed on the Nexter Vextra 8 × 8 technology demonstrator for trial purposes. The turret installation was also provisionally selected for installation on the French Army's Vehicule Blindé de Combat d'Infanterie (VBCI) 8 × 8 Infantry Fighting Vehicle (IFV).
Description
Operation of the Model 811 is by an external electric motor that drives a camshaft lying inside the receiver. This shaft has a spiral cam groove that engages with a lug on the bolt, so that as the shaft revolves, the bolt is moved back and forth. The shaft is also geared to the feed mechanism, so that feed is in strict synchronization with the bolt's movements. A hang-fire safety device is provided. Fire modes are single shot, limited bursts or continuous bursts with a pre-selectable cyclic rate of fire at 125 or 400 rounds/min. The feed direction for the percussion-primed 25 × 137 ammunition can be manually or remotely selected, through an electrical feeder selection device.