A pneumatic gun designed to provide uniform, constant acceleration to a projectile which includes a gas storage tank designed to store a blend of gases under pressure. The pneumatic gun also includes a buttstock that includes a pre-chamber storage vessel in fluid communication with the storage tank. The pneumatic gun further includes a sleeve valve in fluid communication with the pre-chamber storage vessel and designed to control flow of the blend of gases from the pre-chamber storage vessel into a nozzle located adjacent the sleeve valve. The nozzle is shaped to accelerate a velocity of the blend of gases across an axial length of the nozzle. The pneumatic gun also includes a trigger that is designed to open the sleeve valve when the trigger is actuated such that the sleeve valve remains open until a projectile exits a barrel of the pneumatic gun.

A pneumatic gun designed to provide uniform, constant acceleration to a projectile which includes a gas storage tank designed to store a blend of gases under pressure. The pneumatic gun also includes a buttstock that includes a pre-chamber storage vessel in fluid communication with the storage tank. The pneumatic gun further includes a sleeve valve in fluid communication with the pre-chamber storage vessel and designed to control flow of the blend of gases from the pre-chamber storage vessel into a nozzle located adjacent the sleeve valve. The nozzle is shaped to accelerate a velocity of the blend of gases across an axial length of the nozzle. The pneumatic gun also includes a trigger that is designed to open the sleeve valve when the trigger is actuated such that the sleeve valve remains open until a projectile exits a barrel of the pneumatic gun.

A projectile is arranged with antenna, where the projectile is intended for launch in a launch device with a propellant charge in a barrel, where the projectile is arranged with an antenna in the rear edge of the projectile, and where the antenna is arranged behind any of or a combination of: i. a protective cap which protects the antenna during the ejection phase in the barrel and which is removed when the projectile has left the barrel; and ii. a protection in the form of a molding compound arranged to protect the antenna.

A modular air-drop package assembly is provided for delivering an internal payload. The assembly is oriented along axial, radial and angular directions, and includes a front section and a rear section. The front section has a hollow housing open at its rear along the axial direction. The housing has an inner wall that includes a plurality of angularly spaced indentations. Each indentation extends radially into the wall. The rear section has a bulkhead, a sleeve and a corresponding plurality of flanges. The bulkhead closes the housing at the rear. The sleeve extends axially forward from the bulkhead along the axial direction for insertion into the housing. The plurality of flanges extends forward from the bulkhead. Each flange has a radially extending tab that engages with a corresponding indentation of the plurality.