Miroku guns do not follow the choke markings of FN Browning's exactly, though they utilize the same symbols. In the case depicted, the lower bbl. would be a modified based on the symbols alone, while if it were on an FN Browning it would be an Improved Modified.
The 'plus' may be a new way of saying Improved Modified. That is a new marking to me & one I've not seen on a Miroku before. I am assuming it is a fairly new or currently made gun?
Your best bet is to just have the constriction measured & then you will know exactly what each bbl. has in the way of choke.
Screw-in choke fitted Miroku's are generally marked either 'Invector' or 'Invector +' or 'Invector plus' predicated on which chokes are fitted w/the former being generally heavier bbls. & intended predominantly for the European market.
edit: terminology wise, 3/4 choke is roughly the same as 'Improved Modified' whilst 1/2 choke would be a rough equivalent to 'Modified'
Last edited by tw; 05/10/16 08:55 AM.
