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Firing Pin Scrape Marks and the Identification of Firearms G Journal of Criminal Law and Criminology Volume 57 | Issue 3 Article 19 1967 Firing Pin Scrape Marks and the Identification of Firearms G. P. Sharma Follow this and additional works at: https://scholarlycommons.law.northwestern.edu/jclc Part of the Criminal Law Commons, Criminology Commons, and the Criminology and Criminal Justice Commons Recommended Citation G. P. Sharma, Firing Pin Scrape Marks and the Identification of Firearms, 57 J. Crim. L. Criminology & Police Sci. 365 (1966) This Criminology is brought to you for free and open access by Northwestern University School of Law Scholarly Commons. It has been accepted for inclusion in Journal of Criminal Law and Criminology by an authorized editor of Northwestern University School of Law Scholarly Commons. Vol. 57, No. 3 TIZE JOURNAL OF CRINAL LAW, CRaIs0LOGY AND POLICE SCIENCE Printed in U.S.A. Copyright @ 1966 by Northwestern Univemity School of 14w FIRING PIN SCRAPE MARKS AND THE IDENTIFICATION OF FIREARMS G. P. SHARMA G.P. Sharma is Assistant Director, Forensic Science Laboratory, Punjab, India, and is in charge of the Physics Section of this laboratory. Mr. Sharma received his basic training in the Central Forensic Institute, Calcutta, India, and has successfully qualified as an expert in the identification of firearms before the courts of India.-EDITOR. Firing pin scrape marks are frequently found on (of crime and test cartridges) may convince an presentation of the photograph in the fired cartridges. They are very useful in the expert, but the a handicap to the expert rather than identification of the fired shells in the following court becomes a help as illustration. conditions: impression" has diverted our at- 1. When the percussion cap is pierced through In fact "anvil the possibility of using firing pin and thus firing pin indentation is rendered tention to explore marks on cartridges nonidentifiable, scrape. The firing pin scrape to lack of clearance in the following 2. When the percussion cap is blown off, are found owing type of weapons: 3. When 'multi-hits' on the shell spoil other Hammerless guns in which firing pin retreats marking details, 1. to its hole only when the breech is broken 4. When the shells are fired through high grade open, weapons with too smooth firing pin to leave made weapons, the weapons made by individualizing details in their impressions, 2. Locally iron smith who is ignorant of theoretical 5. When the firing pin imprint is too feeble for an considerations and has no specific identification purposes, ballistic precision tools within his reach which are re- 6. When the firing pin nose is filed slightly by quired for the purpose, the culprit in order to escape identification, 3. Defective weapons. the pertinent edge may still be left intact, explanation may be any one of the follow- (thorough tampering invites suspicion), The ing: 7. When the anvil swells up the bottom of the pin is a bit too long. It is more firing pin imprint and masks or distorts the 1. The firing likely in the case of locally made guns or high details therein. grade guns with side locks (with back or bar In the author's laboratory the last listed phe- action), in the latter the firing pin is not in- nomenon has been found often in 12 bore cartridges tegral part of the tumbler (striker) and is manufactured at Kirkee (India), and less fre- replaceable. quently, in the cartridges of foreign make. which restores the pin to its orig- The swelling of the bottom of the firing pin im- 2. The spring inal position after firing, is too slow in its pression, for want of a better term, may be desig- nated as "anvil impression," as the swelling is action. caused by the anvil. As a rule the anvil should be 3. This spring is absent, and the firing pin re- reasonably sharp and rigidly supported at the mains protruded due to sustained pressure of bottom in order to ensure the cap adequate sensi- hammer. It is frequently found in locally tiveness and rigidity. The anvil may or may not be made guns. integral part of the chamber, but it rests on the 4. The pressure developed in the firing is high. bottom of the chamber. The lack of rigidity of the In this case it is likely that the metal of the Other anvil is the probable cause of this trouble. cap surrounding the pin may mould itself soft cap metal, un- factors, such as high pressure, around the pin and retard the motion of it. shape and position of anvil, etc. may favourable A perusal of the literature reveals that no study also accentuate this trouble. When anvil impression has been made to establish utility and importance is present, identification under stereo-microscope of firing pin scrape marks for identification of the becomes very difficult. A composite photograph G. P. SHARMA [Vol. 57 weapons. Burrard observes, "When a striker scrape marks on test and crime cartridges. A systematic is noted it can be of great help as it enables one to study of the firing pin scrape marks was therefore orientate the fired case correctly, that is to place it made to find out whether the scrape marks can be in the same position which it must have occupied used for identification purposes. in the chamber. It is always useful to know and Theoretically, firing pin scrape marks stand on frequently difficult to find out how cartridge fitted the same footing on which the firing pin impression in the chamber (that is which way it was up). But marks stand, which in turn are based on the prin- a striker scrape settles this question at once." ciples of tool marks identification. Tool marks are It shows that firing pin scrape marks are recog- divided into two categories: nized as agency which merely helps to fix up orien- 1. Impression type marks which are produced tation of a fired cartridge with respect to the cham- due to static contact under pressure between ber of the weapon. In a non-repeating break-action a tool and a surface, gun scrape marks are produced at 6 o'clock, 2. Striated or scratch type marks produced by a whereas in a repeating gun the scrape marks of the tool on a softer surface due to sliding contact, firing pin are at the orientation of the ejector im- or to be more specific due to relative motion pression, stated in other words the scrape marks between the two surfaces. and the ejector imprint are situated on the same In the case of impression type tool marks the angular coordinates (polar) usually expressed in impression is negative, the pits and bumps on the o'clock position. It is significant to note that no tool, for example, are imprinted as bumps and pits, mention has been made by this noted author of the respectively. In the case of sliding contact tool ability of the firing pin scrape marks to provide marks, instead of bumps and pits, ridges and val- conclusive evidence for identification of weapons. leys are scratched. The shape, size and relative Other workers and authors have also overlooked location of these striations will be as characteristic and undervalued the agency of scrape marks in the as the details in the tool. As individualizing agents identification of firearms. The author is not aware both type of tool marks enjoy well established whether the importance of the firing pin scrape recognition. marks has been stressed previously for direct iden- The firing pin, ejector, chamber, as well as breech tification purposes. face marks are produced on account of static con- The reason, that this aspect of identification is tact, hence may be classified as impression type. not probed properly, may be traced back to the The firing pin scrape marks are produced due to lack of interest in it. Weapons of offence in ad- relative motion between firing pin (tool) and the vanced countries are usually pistols, revolvers, surface (cap). When impression type tool marks rifles, light machine guns, but rarely 12 bore guns. of the firing pin are accepted, as it should be, for In our country, however, 12 bore weapons form a identification purposes, its sliding contact marks very significant percentage (about 80%) of weap- that is its scrape marks also deserve same recogni- ons used in offence. In autoloading and rifled tion. It may be said that outer shape of the scrape weapons, as a rule, the pressure developed is suffi- marks may vary from round to round for the same cient to obtain even breech face marks. An expert weapon, but the striation details remain the same. is seldom required to probe thoroughly the evidence The usual difficulty with the striated marks is in firing pin impressions and other markings. that one has to do a lot of experimentation for Hence in those countries the interest and studies finding out correct region of contact, angle of tilt, were limited. In 12 bore weapons, however, breech and angle of the progression of the tool concerned face marks etc. are usually non-existent. One has in order to prepare specimen (control) marks under to take recourse to firing pin impression for the practically identical conditions for comparison pur- identification. Sharma2 has brought home this poses. Fortunately in the case of firing pin scrape point graphically. Some of the cases which defy marks the determination of these angles does not identification through firing pin impression, may trouble an expert, for a firing pin scrapes at the find their solution by matching of firing pin scrape same position in the same manner.
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