There isn’t a great deal written in English that I can find on the LS26 light machine gun, but let me share a general outline here and any Finnish fans can come in and correct all the stuff I get wrong…
In 1925/26 the Finns ran trials for a light machine-gun and the LS26 won. Production began the next year and they were produced for both the Finns and the Chinese, though very few made it to China due to the Japanese putting pressure on Finland not to deliver them.
In the West, it served in the Finnish actions against the Soviets during WWII, and against the Nazis in 1944/45. It had a mixed reputation, with some gunners liking its accuracy and others despising it for its unreliability during its early days of service.
When posed against the Soviet DP-28, you can see why some Finns swapped for the Soviet gun. With a 20 round box vs a 47 round pan magazine, the DP has a significant advantage for suppressive fire. It is also simpler to strip and with wider tolerances it was more reliable in field conditions. Weight is mentioned as an issue with the LS, but given the DP is around the same weight I suspect this is more a case of weight vs capability making soldiers prefer their Russian captures.
If you want to see some footage of an LS26 and DP-28 being fired as a comparison to one another you can do so in this short video from Forgotten Weapons.
Vintage Airsoft is currently working on an LS26 for a customer, being an AEG this one should be quite nice to fire in comparison!
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