Well, Jaegers were a product of European craftsman and were made in many different style or "schools." Depending on their use, Jaegers might have had anywhere from a very short barrel (Stutz) to a relatively long barrel up into the 40" length. Early writings often reference short German guns being imported into the colonies. Remember, it took colonial gunmaking time to get ramped up, so imported guns were sought. Some of the early gunmaking is covered thoroughly in the Moravian books written by Bob Lienemann.
The early gunsmiths, such as Albrecht, Dickert and others, were European trained and thus applied this training to produce guns that were in demand in the colonies. These early guns were usually thick in the butt with fairly flat buttplates, but longer of barrel and smaller of caliber than their European counterparts. These guns are often referenced as Transitional or Evolutionary guns to denote that they still retained European influence but were becoming the colonial rifles that were used up through the Revolutionary war.
Change has continued through the Golden Age and into the Late Flint period, then into the percussion period; however, these changes do not represent the transitional phase which ended with the fully evolved colonial rifle.
Ron