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Well a question about the proof marks on my Glock barrel. Who can explain them to me; what is meaning? For instance the "NPV" logo and the letters "ZOY". Please enlighten me :).

 

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From 1982 to 1991 G17s were assembled & test fired in Austria. (Later pistols were assembled and test fired at Glock Inc. in Smyrna, GA.) These early production pistols are marked with an eagle and "NPv". The markings are proof marks and inspectors marks as required on Austrian pistols.
The NPv mark means "Nitro Powder proofed". To get this proofmark, a Gun in Austria has to be proofed with 130% loads.

The Pentagon signifies polygonal rifling

LEB - G-17MB - May 2007 - - white box label, ambi mag release

Here ya go
http://www.phoenixinvestmentarms.com/archives/Proofmarks.pdf

http://www.glockfaq.com/content.aspx?ckey=Glock_FAQ_Serial_Numbers#austrian
 

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The 3 letters represent the barrel test fire date code:

The first letter is for the month:
E...Jan
L...Feb
N...Mar
B...Apr
S...May
Z...Jun
G...Jul
P...Aug
I...Sep
C...Oct
V...Nov
A...Dec

The last two letters are for the year:
O...0
W...1
K...2
R...3
F...4
M...5
H...6
Y...7
T...8
D...9

June 2007 ZOY .. Ill be here till thursday tip your waiters lol
 
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