Model A "Term"

Tom Wesenberg said:
Assault Rifle, early 1928.:D

"A" stands for the first design of the part, and "R" means it must be kept for repairs, as the next design of the part that replaces it can't be fitted correctly to the earlier models.

Early wheels are a common part that many use to determine what they refer to as an "AR" model. The early brake system without the separate parking brake used wheels with a narrow hub, and these can't be properly exchanged with the wider hub later wheels.

The part could also be a "BR", "CR", "DR", etc. depending on how many design changes were made to the part.
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Tom,

I hate to disagree with you but I think the first design of the part isn't assigned a letter. At least that was the way it was where I worked as an engineer. The first time a part was revised (in this case it became obsolete for production) it was assign a letter (A indicating the first revision for parts that hadn't been revised before). As you noted the R was to indicate the part needed to be stocked for repairs but was not used on the production line.

Charlie Stephens
 
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Benson said:
AR-15 to me in 1968 was a rifle:
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If you were carrying an AR-15 in 1968, you were undergunned. You would have had the M-16, fully automatic weapon the AR is the civilian version, semi-automatic which I'm sure 95% of the folks on here know.

And as someone said, 'AR' is only short for ArmaLite Corp. not 'assault rifle' like some fools want people to believe:mad:

So that being said, an 'AR' Model A is the semi-automatic version:)
 
Jeff/Illinois said:
If you were carrying an AR-15 in 1968, you were undergunned. You would have had the M-16, fully automatic weapon the AR is the civilian version, semi-automatic which I'm sure 95% of the folks on here know.

And as someone said, 'AR' is only short for ArmaLite Corp. not 'assault rifle' like some fools want people to believe:mad:

So that being said, an 'AR' Model A is the semi-automatic version:)
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I was wondering if anybody would eventually get the spelling right. Thanks Jeff!
 
Charlie Stephens said:
Tom,

I hate to disagree with you but I think the first design of the part isn't assigned a letter. At least that was the way it was where I worked as an engineer. The first time a part was revised (in this case it became obsolete for production) it was assign a letter (A indicating the first revision for parts that hadn't been revised before). As you noted the R was to indicate the part needed to be stocked for repairs but was not used on the production line.

Charlie Stephens
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Have you seen any parts drawings with the number without the A?
 
Majority of parts in the January 28 parts book are without suffix. although a few are a-xxxx-a or a-xxxx-b. none that I saw are suffixes -ar
 
True that when the part first came out it wouldn't necessarily have any letter suffix, but after changes are made, then the first design should get an "A" suffix, second design a "B" suffix, etc.

That's why it's not right to car a car an "AR", as 1931 parts could also have an "AR" designation.
 
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