2 screws on the front. One on the back. The only identifying mark is a stamped “x”
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As far as the identifying mark in the lower left corner I have been trying to find this out myself
Though I haven't contacted Remington yet
Every trigger I have gone through has a different mark, from a number to a Plus Sign
You could have 20 triggers and each of them will have a different stamp in the lower left
1 has a "4", 1 has a "10, 1 has an "8", 1 has a V, etc etc etc
And seems to have nothing to do with what gun it went to
I presume it may be the employees stamp that assembled the part or that station or something like that
Now, even more strange is, My 40XB triggers even though start as a Rem 700 trigger body
do not have a stamp in the lower left at all
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Another interesting thing if we look close at his trigger, the shoe is hollowed out in the back
Some trigger shoes are solid/flat on the back
I dont know why some are like this and some are not.
here is a pic showing a flat back trigger shoe