The plug (5) is designed with three gas inlet setting to maintain the rate of fire. This design is intended to maintain a constant rate of fire under adverse conditions and NOT TO INCREASE RATE OF FIRE. Gas inlet setting number 1 (6) (number facing the barrel) is preferred for normal conditions.
Setting 1 = 650 rds/m approx. (600 rds/m (M240B/M240N with hydraulic buffer only)) Setting 2 = 750 rds/m approx. (625 rds/m (M240B/M240N with hydraulic buffer only)) Setting 3 = 950 rds/m approx. (650 rds/m (M240B/M240N with hydraulic buffer only))
Place plug (5) with gas inlet setting number 1 (6) facing the barrel.
Install collar (7) on plug (5). Rotate collar (7) until it slips onto plug (5). Press in and rotate to lock in place (pull collar (7) to be sure it is in the locked position).
Remove barrel assembly (10) from vise (2).
This task covers: Disassembly/repair/reassembly INITIAL SETUP
Tools and Special Tools
Spring pin, PN MS51923-152
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