[3] By the end of the year, the Haganah (precursor to the Israel Defense Forces) bought the manufacturing rights to the M1941 Johnson machine gun from the Winchester Repeating Arms Company and developed the Dror in its own clandestine workshops.

The Pattern 1 Drors had a physical resemblance to the Johnson, including the tall front sight and the barrel release.

[7] The Pattern 2 Drors had many changes from the first one by adapting to a rimless round and the use of modified 20-round BAR LMG magazines to balance the weapon.

[7] A folding cover is also mounted over the magazine well so that the gunner can close it to prevent dirt and other foul elements from going inside when the weapon is not used.

Following combat simulation testing, the Israel Defense Forces selected the FN Model D (a derivative of the M1918 Browning Automatic Rifle) to replace the Dror in 1952.