Brian Rothhammer
AH fanatic
Page 50 of 1939 Stoeger catalog.
Notice how rounded grip is shown on stutzen (full stocked carbine) while flattened grip with horn cap is shown on 'High Velocity' and 'Take Down' models.
The stutzen image was actually outdated by then as the rounded grips are almost always found on earlier MS.
My M1910 Take Down Model has the flattened grip with removable grip cap for storage of spare sight bead as shown here:
It also has the 'Special folding peep sight' from the options list shown in Stoeger catalog: