There are two types of recoil mechanisms used on the M242 Enhanced and Standard guns. The M242 Enhanced Gun can only use the 12524530 recoil mechanism. It can be identified by it's 16 outer ring springs. The M242 Standard Gun must use the 12524420 recoil mechanism. It can be identified by it's 17 outer ring springs.
There are two different lengths of recoil housing caps. Part numbers 12524529 and 12524422, revision C or higher, have an overall length of 4.3 in. (109.1 mm). This length cap must be used on the M242 Enhanced Gun. Part number 12524422, revision B or lower, is 4.49 in. (114.0 mm) long. Either cap may be used on the M242 Standard Gun.
1. PLACE AUTO GUN RECEIVER ON A CLEAN, FLAT SURFACE. Position auto gun receiver (1) with recoil mechanism (2) on top.
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