crofton Posted January 9, 2012 Share Posted January 9, 2012 (edited) What are the markings and designs on the M4, barrel & receiver: for example; 18 3 PSF CH Edited January 10, 2012 by crofton Quote Link to comment Share on other sites More sharing options...
Lakotah Posted January 10, 2012 Share Posted January 10, 2012 Picture would be more helpful Quote Link to comment Share on other sites More sharing options...
benelliwerkes Posted January 10, 2012 Share Posted January 10, 2012 Should have a CAM.76 = chamber length in millimeters = 3 " Your 18.3 is the barrel diameter in millimeters = 12 gauge PSF with the two stars above are Proof markings of testing for safety with magnum loads Your CH is probably incorrect......as it is a date of manufacturing code......which would mean a 2013 build date......see attached table for correct code and date. Busy right now to provide full scoop on Italian proof marks....but this example of a 20 gauge barrel should hold you over for now.[ATTACH=CONFIG]1236[/ATTACH] [ATTACH=CONFIG]1237[/ATTACH][ATTACH=CONFIG]1238[/ATTACH][ATTACH=CONFIG]1239[/ATTACH] Quote Link to comment Share on other sites More sharing options...
crofton Posted January 10, 2012 Author Share Posted January 10, 2012 (edited) http:// benelliwerkes, you certainly have a better camera than I, in any event thank you for the detailed explanation. For sure I have CH, on the receiver and barrel. Don't have the CAM.75, but on the right side of the barrel, it has 2 3/4 to 3". http:// Edited January 10, 2012 by crofton Quote Link to comment Share on other sites More sharing options...
benelliwerkes Posted January 10, 2012 Share Posted January 10, 2012 (edited) Well, after studying the date code chart a little closer, I see that in the "B" series of date codes, Benelli did NOT use "BE" or "BG".........if we extrapolate to their same system of skipping "CE" and "CG"........this would mean that 2010 date code = CF and a 2011 date code = CH.........BINGO ! Italian word for "chamber" = camera......CAM is abbreviation; the chamber length is provided in millimeter lengths, 70 mm = 2-3/4" whereas the 76 mm = 3 " chamber . PSF = Polvere Senza Fumo = Smokeless Powder gun proof One * over the PSF = non magnum load proof test Two * over the PSF = Prova Superiore = superior proof for magnum load certification which was introduced for use in the 1960's. The cartridge proof load that is tested in the barrel is generally 20 - 30 % more powerful than the designated end-use of that particular barrel, which is essentially the margin of design safety.Current practice has proof pressures at 1020 and 1370 bars for normal and magnum proofs, respectively. The same designs that were proofed for 1200 have no problems passing 1370 bars. It is also interesting that some companies, notably Benelli, proof their guns in house at even higher pressure before submitting them to proof. PROOF MARKS. Proofing the barrel of a gun began as a means to insure its safety and integrity. Proof Houses were established by law in almost every country and it was required that weapons sold within the respective country, and for export, be able to withstand a prescribed load without damage. When this test was successful the weapon was stamped with a seal to acknowledge the test - which is called Proof Marks. These marks then tell us the country of origin of the weapon. Proof Marks change over time and therefore assist in dating arms. All guns offered for sale in all countries aligned with the CIP (Commission International Proofing), have to meet certain requirements. These standards stipulate that the strength of the barrel and action will ensure that the gun is safe for its intended purpose. All guns must carry proof marks to show that they have been tested and have passed the proof test, which basically means that the gun has fired a cartridge or cartridges that substantially exceed the maximum service pressure for which the gun is intended. Having fired an over-pressure ‘proof' load of around 20% - 30 % greater than its certified service pressure, the gun is stamped by the proof house. The “level” of Proof is dependant upon the caliber and chamber length of the gun, and whether it's intended for extra-heavy ‘magnum' loads such as some wildfowling cartridges; the testing and proof marks stamped on barrel and action will reflect this. Steel shot imposes a number of factors that affect the pressure produced by such loads. The need to launch the lighter pellets at elevated velocity to approach any kind of parity with lead loads is well documented. The fleur-de-lis (iris flower) icon proof designates approved for steel shot loads. [ATTACH=CONFIG]1240[/ATTACH] Edited January 11, 2012 by benelliwerkes Quote Link to comment Share on other sites More sharing options...
Wrinkles Posted January 16, 2012 Share Posted January 16, 2012 Why is the number on the barrel different than the serial number? Does the barrel number/code have some special meaning? Quote Link to comment Share on other sites More sharing options...
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