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AR15.COM
12/29/2008 12:03:17 PM EDT

This is a 1991 A1, I believe this is a no frills Model but that cutout for the slide lock strikes me as strange.
12/29/2008 12:26:40 PM EDT
[#1]
Did Colt do this ?


yes
12/29/2008 12:29:52 PM EDT
[#2]
Thank you, you have no idea how relieved I am as I just purchased this pistol.
12/29/2008 12:31:32 PM EDT
[#3]
12/29/2008 12:36:47 PM EDT
[#4]
I have a MK IV Series 80's I bought NIB in 1995 that has the same style cut out. Yeah they did it .... WarDawg
12/29/2008 5:00:06 PM EDT
[#5]
yeppers
12/29/2008 7:10:26 PM EDT
[#6]
YES,

now to elaborate.  The Delta Elites started cracking frames at this location. so Colt started milling all of their frames in this manner and did so for several years.  On the new "retro" guns Colt went back to the traditional shape because folks complained.

Now go clean that frame, looks awful.
12/29/2008 10:51:53 PM EDT
[#7]
You should have cleaned it before you noticed that!  Grease - Oh GOD!!! You need to post pics of the whole gun now!
12/30/2008 3:59:57 AM EDT
[#8]
I will have to go look at  mine again but from what I think I remember is it's a straight cut out with the corners being completely 90 degree square. Why didn't they leave a tiny radius in the corners for strength and crack resistance ? I have worked as a machinist for many years. Mostly conventional equipment. Job shops ... I guess it is a non issue with them. But I always study how things are machined. Can't help it.... Cheers WarDawg
12/30/2008 4:41:22 AM EDT
[#9]
It is called the "DELTA CUT".
1/7/2009 9:03:01 PM EDT
[#10]
Quoted:
http://i12.photobucket.com/albums/a245/ak_rabon/DSC_0052.jpg
This is a 1991 A1, I believe this is a no frills Model but that cutout for the slide lock strikes me as strange.



I don't know why Colt is doing this to their .45 frames but that was originally a mod to my Delta Elite 10mm to prevent the frame from cracking in that spot. I guess they just continued it as a good business practice.