The Iver Johnson Hercules had quite an evolutionary run. It began with the W.H. Davenport Arms Co. with their mono-block barrel gun with sideplates --
![[Linked Image from i.imgur.com]](https://i.imgur.com/eDz8oqA.jpg)
![[Linked Image from i.imgur.com]](https://i.imgur.com/CfmO8Mz.jpg)
When W.H. Davenport folded up the remains went to Hopkins & Allen and the sideplate double with mono-bloc barrels became the Hopkins & Allen No. 110 --
![[Linked Image from i.imgur.com]](https://i.imgur.com/zJTrwGD.png)
![[Linked Image from i.imgur.com]](https://i.imgur.com/WlhP1QV.jpg)
When H & A folded up, Iver Johnson picked up the gun --
![[Linked Image from i.imgur.com]](https://i.imgur.com/lFsFRHt.jpg)
![[Linked Image from i.imgur.com]](https://i.imgur.com/ZDaAlmv.jpg)
By 1919 Iver Johnson got rid of the sideplates but still had the mono-bloc barrels --
![[Linked Image from i.imgur.com]](https://i.imgur.com/ohUdSXg.jpg)
![[Linked Image from i.imgur.com]](https://i.imgur.com/6Q9WgDN.jpg)
Between 1921 and 24 Iver Johnson dropped the mono-bloc barrels and went to chopper-lump barrels.
The rib extension that does the bolting on the Hercules is only about half the size the Lefever Nitro Special rib extension.