The Interruptor Ejectors with no arsenal marking are the most common.
These are marked with the Tula Star. Out of over a thousand of these, roughly 30 were marked Tula and 20 Izhvesk, The rest were unmarked.
Original Mosin Nagant Rifle Interruptor Ejector without spring, will work on all variations of Mosin Nagant rifles including the Russian M1891, Russian M91/30, Russian M38, Russian M1944, Chinese Type 53, Romanian, Hungarian and Finish Mosin Nagant Rifles
