Our trunnions are made to be a exact replacement for the Russian 4.5mm folding trunnion. They are machined in the USA from 4140 chromoly steel. Then Parkerized for a great finish or a base coat for your coating process. These will accept all Russian and Bulgarian latches, springs, stocks, and keepers (we have these if you need them). But will not accept the Taiwanese style without a slight modification to the latch.
These count towards your 992r parts requirements.