M240 Gas Regulator Collar

Barrel and barrel adapter have left-hand threads.

(M240B/M240D/M240G/M240N): Place catch spring (34) into barrel catch (33). Install barrel catch (33) into carrying handle assembly (27). Hold carrying handle assembly vertically, place firmly against front shoulder of barrel (12).

Machine Gun Mag M240

DIRECT SUPPORT MAINTENANCE OF BARREL ASSEMBLY M240/M240C, NSN 1005-01-044-1026, PN 11825985; M240B, NSN N/A, PN 12976817; M240D/M240G/M240N, NSN 1005-01-408-5897, PN 12976818; M240E1, NSN 1005-01-251-9701, PN 12597035 (cont)_

REASSEMBLY (cont)

Screw barrel adapter nut (25) onto barrel (12) finger tight.

Unscrew barrel adapter nut (25) until barrel catch (33) engages the recess in the carrying handle assembly (27).

Secure carrying handle assembly (27) to barrel adapter nut (25) by tapping barrel nut locking pin (26) out approximately 1/8 inch until it engages the stops on the carrying handle assembly.

Disassembly M240

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1BL0133

NOTE

The plug (20) is designed with three gas inlet settings to maintain the rate of fire. This design is intended to maintain a consistent rate of fire under adverse conditions, NOT TO INCREASE RATE OF FIRE. Gas setting number 1 (35) (number facing the barrel) is preferred for normal conditions.

1BL0134

1BL0134

Setting number 1 = 650 rds/m approx. (600 rds/m (M240B/M240N with hydraulic buffer only)) Setting number 2 = 750 rds/m approx. (625 rds/m (M240B/M240N with hydraulic buffer only)) Setting number 3 = 950 rds/m approx. (650 rds/m (M240B/M240N with hydraulic buffer only))

Clamp barrel (12) in vise (13) with protective jaws (14) below gas regulator area with gas regulator area (15) pointed up.

Place plug (20) with gas inlet hole number 1 (35) facing barrel (12).

1BL0135

Rotate collar (19) until it engages, then push it in.

M240 Gas Regulator

DIRECT SUPPORT MAINTENANCE OF BARREL ASSEMBLY M240/M240C, NSN 1005-01-044-1026, PN 11825985; M240B, NSN N/A, PN 12976817; M240D/M240G/M240N, NSN 1005-01-408-5897, PN 12976818; M240E1, NSN 1005-01-251-9701, PN 12597035 (cont)_

REASSEMBLY (cont)

(M240B/M240D/M240E1/M240G/M240N): If removed, install front sight assembly (18) and secure with two front sight adjusting screws (17).

Use 23mm box and open end combination wrench (16) to install flash hider/suppressor (8). Remove barrel (12) from vise (13).

240 Gas Regulator Nsn
13 14

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This task covers: a. Disassembly b. Inspection/Repair c. Reassembly INITIAL SETUP

Tools and Special Tools

Shop Set, Small Arms: Field Maintenance, Basic Less Power, PN SC 4933-95-CL-A11; SL-3-08724A (Marine Corps only); SL-3-00607A (Marine Corps only)

Materials/Parts

Wire, Steel, Cres., Safety, PN MS9226-04

Equipment Condition

Carrying handle assembly removed from barrel (WP 0024 00).

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Responses

  • alfredo
    What thread is on m240 barrel adapter?
    8 years ago
  • laura
    How to put the gas regulator on the 240b?
    2 years ago
  • linda
    What gas setting on m240 for firing blanks?
    5 months ago
  • Christine
    Is it bad if you cannot remove the gas regulator by hand on a m240b?
    23 days ago

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