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A proof mark is a symbol and/or series of letters and/or numbers stamped into a firearm or gun. It may occur on the barrel, cylinder, frame, receiver, or all of

the above. The purpose of the mark is to indicate that the part in question has been tested with a proof load, and is thus safe to fire with standard

ammunition loads.

Many countries have national proof houses, where every gun made in that country must be proofed. Those that pass the proof test are marked with proof

marks, and then may be exported or otherwise sold to consumers.

The United States of America has no national proof house, so guns are routinely proofed by many (but not all) manufacturers, and are generally marked with

proof marks after passing the proof test.
 

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Proof loads are rounds of ammunition loaded to produce higher-than-normal pressure in a given firearm. The purpose is to proof test a gun's strength to ensure

that it will handle standard loads of the ammunition for which the firearm was designed.


The term "blue pill" is sometimes used in place of "proof load." A blue pill is a higher-than-average proof load, generally used by the military to test firearms

strength, and they are usually colored blue.


Standard commercial proof loads, on the other hand, are usually red in color. These loads are usually loaded with steel cases rather than the usual brass, and

may often be plated with tin.
 

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Ivan's Glock was made entirely in Austria...where by law it must be proofed.

Your Glock was made from parts from Austria and assembled in Smyrna, Georgia...USA

where proof marks are not required by law.
 

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For the love of all things holy... what does Shooter not know about Glocks and just guns in general.

I need to just subscribe to him on here... a wealth of knowledge.
 
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