Remove heat shield from barrel (M240B only).
Clamp on gas port area (1) only.
Secure barrel assembly (12) in a vise (13) with protective jaws (14) with gas regulator (15) up.
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)_
Rotate collar (19) until it releases, and then pull it out.
Drive out plug (20) and be ready to catch it to prevent damage. Remove barrel (12) from vise (13).
Clamp barrel assembly (12) in vise (13) with protective jaws (14) above the gas regulator area with gas regulator (15) pointed down. Place a block of wood (21) as shown to steady barrel assembly (12).
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