One of the more unique rifles around in its time, the Remington–Keene is an American bolt-action, tube-magazine rifle by Remington in the late 1870s. It was built around a turning bolt with an external hammer and a tubular magazine under the barrel and chambered for .45-70.
The manual of arms was that the hammer was required to be cocked after reach shot, to exercise precise shots and that the officers can see if the weapon was fired or not. Also interestingly enough there is a magazine cut-off so that the last 9 bullets were used in last resorts, which can be seen in the later rifles such as Lee-Enfields and so on.
For H3, the user can load the shell individually into the loading gate below, then chamber an additional round. Once the bolt is pulled back, it'll engage the hammer into a half-notch, which the user has to manually cock it against to fire.
The rifle can take muzzle mounts as well as a W330 scope on the side.
Model from Akinaro, with support from Zonk, Tweedy, Vague and Curry!