The Navy has a program call “Navy’s Advanced Low Cost Munition Ordnance” or “ALaMO”
Justification as provided to Congress is here. The proposed budget includes $5.759M in FY2017, $25.984M in FY2018, and $24.982M in FY2019. The round is expected to be operational in 2020 (about the time the first OPC comes out).
“Advanced Low Cost Munition Ordnance (ALaMO) significantly increases 57mm MK 110 Gun Mount lethality and effectiveness against Fast Attack Craft and Fast In-Shore Attack Craft (FAC/FIAC). The 57mm ALaMO funding supports non-recurring engineering, design verification testing, environmental qualification, hazard classification, insensitive munitions and developmental testing. ALaMO will be qualified for USN use at the conclusion of the program.”
A US Naval Institute News story, “Wrapup: HASC Passes FY2017 Defense Bill With Reagan-Era Spending Levels,” indicates House Armed Services Committee interest in speeding up the program.
“A provision in the bill notes interest in the Navy’s Advanced Low Cost Munition Ordnance (ALaMO), a 57mm guided projectile that could be used on the LCS, and requests information on what it would take to achieve initial operational capability by 2019.”
Sounds like the Coast Guard should have a few of these rounds as well, both for small, fast, highly maneuverable targets, and to target specific areas on larger targets. We had some indication this was coming before.