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R Marked Bright Bolt, Colt?


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Hi everyone, i recently came across this bolt,

 

despite its dark look from the pictures, is one of the early bright type. Whats interesting is the lack of a S mark and the presence of a R instead of the same font that is usually found on the rear plate of Colt

 

buttstocks. is this a Colt era bolt? It also seems to be modified at the back in order to engage the safety even when not loaded.

 

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Edited by indochinavet
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All original Colt bolts were unmarked and it looks like a WW2 bolt to me IMHO.

 

But that being said who knows who might have stamped anything in 95 years.

 

The easiest way to be almost certain any bolt is a colt bolt is that they are much much longer than WW2 bolts.

Put it next to a WW2 known bolt, if it is not much longer overall it’s not Colt.

If it is let us know and I can get he overall dimension for you to check.

 

Larry

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It is definitely a World War II bolt manufactured by subcontractor Remington Arms.

 

See Page 390 of The Ultimate Thompson Book to find "Modifications Instruction No. 3" from the Canadian military on how to modify 1928A1 Thompson bolts in this manner. What this modification does is allow the user to engage the safety when the bolt is in the forward position. This prevents the bolt from moving if the Thompson is dropped. I believe some military drop tests revealed the 1928/1928A1 Thompson gun, if dropped on its butt stock, could result in the bolt moving backward, picking up a round from the magazine, and firing. I believe I have some British military information on this modification too.

 

M1/M1A1 bolts were manufactured with this feature.

 

Let me know if you are interested in selling that bolt. At a minimum, I would like to get to high resolution pictures.

 

Thanks for sharing!

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Its my experience that WWII manufactured 28 bolts used the same dimensions as Colt era 21 bolts. There seems to be some very slight variances for war time production methods but nothing involving length or other critical dimensions. The Colt is on the right in the unlabeled picture at bottom center.

 

 

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