 While heavier than the 5.56×45mm NATO M249 due to its larger chambering and heavier barrel, the Mk 48 Mod 0 is still 17% lighter and 8.4% shorter than the M240.The disadvantages of Mk 48 Mod 0 are that the life of the receiver is only about half of the M240B, and the effective range with accuracy are slightly lower than the M240B.The Mk 48 Mod 0 is currently in service with certain USSOCOM units, such as the U.S. Navy SEALs and Army's 75th Ranger Regiment.