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In page Lockheed AC-130:

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The conceptual breechloading variant of the 120 mm M120 mortar has several key advantages over the conventional M102 105 mm howitzer. 100 rounds of ammunition weighs 4,200 lb (1,900 kg) for the M102 105 mm howitzer compared to 3,200 lb (1,500 kg) for the M120 120 mm mortar. The recoil load is 10,900 lbf (48,000 N) with the 105 mm howitzer compared to 5,600 lbf (25,000 N) with the M120 120 mm mortar. The gun recoiling weight for the M102 105 mm howitzer is 1,465 lb (665 kg) compared to 1,315 lb (596 kg) for the M120 120 mm mortar. The muzzle pressure for the M102 105 mm howitzer is 3,560 psi (24.5 MPa) compared to 1,620 psi (11.2 MPa) for the M120 120 mm mortar.[citation needed]