This is a very rare, early example of a French Model 1907/15 straight pull military rifle produced by the MAS factory. It has a very low serial number “4” indicating it was probably one of the first test or prototype rifle manufactured. This model is patterned somewhat after the original Model 1902 and 1907 rifles but in a manual, straight pull type design vs. a bolt action design. They were only produced for a very short time and then France developed the Model 1917 semi-automatic rifles.
Early French Mas 1907 Prototype Semi-Automatic Rifle Serial # 4
Soviet 1936 Prototype Mosin-Nagant Bolt Action Rifle
[
![r/ForgottenWeapons icon]rbine chambered for 9x23mm Largo, model "JUPITER(https://www.reddit.com/r/ForgottenWeapons/comments/uf859t/unusual_bolt_action_carbine_chambered_for_9x23mm/)