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Serial number 618603 is a Model 1911 number. Ordnance toyed with the idea of converting the 1911 receivers to 1911A1 configuration, but decided against it. Occasionally a rebuild from Anniston Army Depot will show up with the finger cutouts, but it was not officially done.

Along the same lines, the WWII Remington 03-A4 Sniper rifle receivers were still marked 03-A3, supposedly so the receiver could also be used on a standard 03-A3 rifle. A few of the sniper rifles have shown up with the 3 in A3 obliterated and a 4 stamped in it's place. I always figured that someone at a rebuild facility took it upon themselves to correct the marking, and not done officially.

When the so called "Transition" pistol came out in 1924 it was to be an "improved" Model 1911. In 1926, Ordnance decided that the pistol would be a 1911A1, and that any pistol under serial number 700,000 would remain a 1911, and any pistol above serial number 700,000 would be a 1911A1. Model 1911 production ended at serial number 629,500 in 1919.

 

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Not all arsenal rebuilds were marked, but the Anniston pistols I have seen that were modified were. Over the years I have seen a few Model 1911 receivers with the finger cutouts added with varying degrees of skill. Most appeared to be Bubba added.

As far as I know, no other Model 1911's with the finger cutouts added have shown up from rebuild facilities other than Anniston, and they are all marked with ANAD and the date. Since Ordnance nixed the idea, I feel that someone at Anniston took it upon themselves to modify the Model 1911's.
 

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As noted in my previous post, there was some deliberation about adding finger cutouts, but it was decided not to do it. Virtually all experimentation projects involving the Model 1911 came out of Springfield Armory. These ranged from fully automatic pistols to silencers to experimental sights. Examples of some of these still exist.

If the cutouts were done on a milling machine there is no reason that they couldn't be as good as those on original pistols.
 

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Without something indicating where the cutouts were done the chances are greater that they were not done by Ordnance. Since there was no order to put finger cutouts in the 1911 receivers, it appears that the ANAD pistols so modified were done unofficially. I don't believe I have ever seen another 1911 with the cutouts identified by any rebuild marking.
 
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