Originally Posted by WDB
The flash suppressor belongs to a M14 not a mini 14, the lug on the botton and the reliefe on the collar leads me to that beliefe. There is a big difference between the two rifles IMHO
Sorry my friend, the FH is for a Mini. It is held in place with the roll pin (though a longer pin is required to keep it on right).
M14 flash hider is held on with the Castle Nut. Here is one reamed to National Match specs by Ronnie Morris.
Here is a slightly better pic of an M14 FH.