I have allways pressumed these type of BFA's were for crimped blank -
The MKI BFA for bulleted (wooden) blank having the deflector plate to throw any nastyness downwards.
I have seen the MK2 crimped blank BFA barrels in the UK and US but only so far on MK2 barrels and painted red rather than yellow.
Can't help on the thread type I'm afraid as I have nothing to gauge the threads.
ATB KevinInformation
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