From the very beginning of the Lefever Arms Co in 1883 the guns were all ordered. That is, no gun was produced until an order was placed by a buyer. They advertised the guns in their early catalogs with full pistol grips. You could order whatever LOP and drop you wanted. You could order a staight stock if you wanted. Very few of those seem to be around.
This would seem to indicate a buyer preference at that period of time.

Great-Great Grandson of D.M. Lefever
www.lefevercollectors.com