Left Extractor Cam Modifications - Casing (Receiver) Group
Feed Extractor Cam NSN# 1005-21-874-8292
When the .30 caliber M1919A4s were convert to the C1 the original feed extractor cams were not modified. During service the C1 suffered from a low round stoppage. The low round round stoppage which is not good for combat weapon could crack or break the T-slot on the breech bolt again not good in combat. The low round stoppage problem was traced back to the length of the 7.62mm NATO cartridge and the angle it was fed into the T-slot and the chamber of the barrel. This modification in the C5A1 upgrade process was to correct a problem with low round stoppages due to the use of the original .30 caliber Feed Extractor Cam which was retained on the remanufactured C1 guns. As part of the modifications to C5A1 upgrade from C1 the rear feed extractor cam were modified to correct the feeding angle of the 7.62mm NATO cartridge. The rear Feed Extractor Cams were removed and modified and reinstalled. This modification is easy and will require new rivets to reinstall the C5A1 extractor feed cam.
-fjruple
Feed Extractor Cam NSN# 1005-21-874-8292
When the .30 caliber M1919A4s were convert to the C1 the original feed extractor cams were not modified. During service the C1 suffered from a low round stoppage. The low round round stoppage which is not good for combat weapon could crack or break the T-slot on the breech bolt again not good in combat. The low round stoppage problem was traced back to the length of the 7.62mm NATO cartridge and the angle it was fed into the T-slot and the chamber of the barrel. This modification in the C5A1 upgrade process was to correct a problem with low round stoppages due to the use of the original .30 caliber Feed Extractor Cam which was retained on the remanufactured C1 guns. As part of the modifications to C5A1 upgrade from C1 the rear feed extractor cam were modified to correct the feeding angle of the 7.62mm NATO cartridge. The rear Feed Extractor Cams were removed and modified and reinstalled. This modification is easy and will require new rivets to reinstall the C5A1 extractor feed cam.
-fjruple