I recently purchased a NHM-91, Did some research and i've found info stating, they had anywhere from 19"-23.75". Now i measured mine from front trunion and it messures 18". It also appears to be a threaded barrel, looks the same as my 51 Russian sks. I'm confussed everything i read says they were pressed in barrels. I can understand if they are counting inside trunion, Anyhow i would appreciate any info, i'm not very familiar with this model.