After the war the Siamese liked the M1 Carbine so well and without money to purchase them the mofified the T38 long rifles into look alike M1Carbines ro thier own use. The Army and the Police both used them. This is an Army rendition.
Or ...maybe... they were thinking of the Enfield Jungle Carbine? Or..was the Enfield NO. 5 a response to the M1 Carbine too? Who knows.