IBM Hack saw cuts and P proof questions ??

[Harlan (Deceased)]

Charlie,

I just located a few photos of the IBM I had if this is any help. I don't have a photo showing the proof though.

Mine had the milled cut and the SN was 3901426 with an AO reciever.

[painter777]

Thanks Harlan...
After getting the spotters report from sk1ski and seeing the pictures that Brian posted showing the no date IBM barrels with the plain P stamp. I can only assume that either a serif or san serif P could be correct. Maybe IBM did use 2 different style P proof stamps. Wondering now if it was possible that their barrels might have been proof stamped in 2 different locations. (?)
Don't really have a choice since 1 of the 3 barrels is a Blue Sky with the Serif P. I plan to use the nicer of the other 2 and both are No date with the plain P stamp. Will swap it out as soon as I can lift and tug on the receiver wrench.

Thanks to all for the help,
Charlie

[phil441]

OK Guys,
Please excuse a stupid question from the clueless one,
but what was the purpose of the hack saw cut?

Thanks,
Phil

[Bill Hollinger]

I have wondered that also. Here is what I think. All the saw cuts I've seen have had the forward edge peened into the sight key and some against the rear of the sight. I wonder if this may be some way to add to the securing or tightening of the front sight. I've seen a few without the saw cut with lose front sights.....

[phil441]

Thanks Bill.
That's the only thing I could come with. I had noticed that the "bridge" on some of the cuts seemed to be slightly deformed. I wonder if it was done to make up for a manufacturing tolerance problem with the diameter of some barrels. I've often wondered why more mfgr's didn't do that if it worked so well.

Phil

[skohler]

Not sure if you are still trying to figure this out. I'm pretty sure mine is a non-serifed P, not sure about the hack saw cut. Doesn't really look like there is one, so here is a pic, 3.89 series, all original.

http://i483.photobucket.com/albums/r...3292007035.jpg