Auto Gun Receiver Operation

BARREL SUPPORT ASSEMBLY

MECHANICAL INTERLOCK

BARREL SUPPORT ASSEMBLY

MECHANICAL INTERLOCK

M242 25mm Drivetrain

HANDLE PIN

RECOIL MECHANISM

HANDLE PIN

RECOIL MECHANISM

SEAR CATCH ASSEMBLY

SAFETY LINK TRACK

ASSEMBLY

MANUAL SEAR

RETRACTOR ASSEMBLY

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a. AUTO GUN RECEIVER: Rams and fires rounds. Extracts and ejects spent cases or unfired rounds. Contains a mechanical interlock system that stops the gun if a round misfires or hangfires. The auto gun receiver consists of the receiver gears, track assembly, and bolt and carrier assembly, and includes the following subassemblies:

(1) BARREL SUPPORT ASSEMBLY: Holds breech assembly in auto gun receiver and supports barrel.

(2) RECOIL MECHANISM: Absorbs most of recoil force when round fires. The enhanced gun features a longer recoil stroke to further reduce recoil load.

(3) BREECH ASSEMBLY: Fits into front end of auto gun receiver and around barrel. Breech assembly and bolt lugs lock to contain explosive force when round fires. The enhanced gun features a larger breech that is not interchangeable with the standard gun.

(4) SEAR: Controlled by electrical sear solenoid and mechanical interlock. Locks roller assembly chain in event of misfire, by engaging the safety link, and in the SEAR position, by engaging the master link.

(5) SEAR CATCH ASSEMBLY: Keeps roller assembly chain from rebounding backward during firing recoil.

(6) SEAR RETRACTOR ASSEMBLY: Provides a means to manually disengage the sear during manual emergency operation.

(7) MECHANICAL INTERLOCK: Engages sear to stop bolt from being unlocked from breech assembly if there is no recoil (round misfires or hangfires).

(8) DIRECT CURRENT MOTOR: Drives gears and mechanism required to operate gun. The enhanced gun direct current motor provides a jumper connection that enables vehicle BIT.

(9) HANDLE PIN: Applies spring tension to lock feeder handle on one side and provides a lock on the opposite side.

(10) ELECTRICAL SEAR SOLENOID: Provides electrical control of sear through the release link and sear push rod.

(11) RIVETED RECEIVER: Contains or provides attachment for all auto gun receiver components and subassemblies. The enhanced gun riveted receiver features a larger front housing to accommodate the larger breech.

Gun Receiver

b. RECEIVER GEARS: Driven by direct current motor. Receiver gears work as follows:

(1) BEVEL GEARS: The small bevel gear, mounted on the motor shaft, drives the large bevel gear, which in turn drives the clutch assembly. The enhanced gun requires a unique set of gears to accommodate its triple spring clutch assembly.

(2) CLUTCH ASSEMBLY: Drives spur gear cluster. If gun jams, clutch assembly slips to prevent damage to drive train. The enhanced gun requires the triple spring clutch assembly.

(3) SPUR GEAR CLUSTER: Drives the straight drive shaft and spur assembly gear.

(4) STRAIGHT DRIVE SHAFT: Drives the feeder drive assembly.

(5) SPUR ASSEMBLY GEAR: Drives the drive sprocket in the bolt and track assembly.

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