As a matter of interest, the Indian cut-short Mk1 barrels shown above were the same length as a Mk4 (from a Mk3 gun....) barrel. So in theory, will shoot the same. In theory. But the sight radius was reduced. But i doesn't end there...... The backsight leaf on the Mk3 gun was taken straight from the Mk2 gun wasn't altered to reflect the shorter barrel and sight radius and never reflected the actual trajectory of the bullet from a Mk3 gun. Same applies to the Mk1 drum when using these cut short Mk1 and 1* barrels. But waste not, want not as they say