Gen 4 trigger bar - top edge indentations

[YVK]

I took apart my Gen 4 17; wanted to learn how to do a polish job on Glocks. The trigger bar's top edge has two little indentations on it. Anybody knows what those indentations are for, or is it a manufacturing by-product? If they serve no purpose, should they be "softened" with a file?

I have a hi-res photo, but the Photobucket seems to be down.

[JV_]

I have a hi-res photo, but the Photobucket seems to be down.You should be able to post it as an attachment. Look for the paperclip in the formatting bar.

[YVK]

975

Done.

[Chuck Haggard]

I'm pretty sure that area of the trigger bar isn't in contact with anything, and thus not an issue at all. I'll have to strip my gen 4 when I get home and make sure.

[JV_]

I wonder if it's some type of identification mark to note a revision, to deal with the dead triggers that have been popping up?

[RM686]

I have 3 GEn 4 and 1 aftermarket Phampton trigger for gen4s and they all have these cut outs. Must be part of the manufacturing process as I can see no function that they perform.

[Spr1]

I suspect it is an artifact of manufacture, likely from being made on a progressive press. A progressive press feeds a strip of material through a series of forming operations using the material itself to control the position of the parts being formed. The last operation shears the individual pieces from the strip.
Think of a machine gun belt moving through the gun to visualize it.