A muzzle brake was fitted and the recoil system adjusted to allow the use of a more powerful charge and new long-range shell.

The 10.5 cm leFH 18M was also in service with the Syrian Army, one example being preserved in the Military Museum in Damascus.

[5] The type has seen occasional service with rebel groups during the Syrian Civil War, in July 2013 and May 2015.

[6] Many were converted from the 10.5 cm leFH 18 and retained their original wood-spoked or pressed steel wheels.

[7] The new FH Gr Fern long-range shell was about 25 millimetres (0.98 in) longer than the normal shells used by the leFH 18 guns, but had a shorter streamlined section behind the driving band to accommodate the larger powder charge required.