Forums / Gun Discussion / Glock rifling harder to match a bullet

5 years 28 weeks ago, 7:49 PM

mtakedown

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An interesting sentence in the article is "A negative for law enforcement is that the rifling of the barrel makes it almost impossible to match a bullet to an individual weapon with ballistic tests, Kobilinsky said." I had never heard of this before. I know that both Glocks and HK use polygonal rifling.

Where does his statement originate from?

5 years 28 weeks ago, 7:56 PM

HecklerKoch45

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Not sure

Not sure, I dont really know how the CSI units do all that crap so I have no idea. Thats interesting though. I do know that glocks make a distinct mark on the primer if you look at the casing it is like a rectangle shape. That will be a dead giveaway that the gun involved in a crime was a glock, but not sure about comparing the rifling to the marks on the bullet. not quite sure how they do all of that.

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5 years 28 weeks ago, 9:36 PM

mattitude

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I would doubt that it would be "impossible", but definitely more difficult. From the wikipedia article on Ballistic Fingerprinting:

"Polygonal rifling may leave striations that are difficult to match to a particular barrel."

http://en.wikipedia.org/wiki/Ballistic_fingerprinting

I don't use wikipedia as a 100% trust worthy source but their explanation of striation matching and polygonal rifling makes sense.

"...one is allowed to resist against the unjust aggressor to one's life [...] even 'til the aggressor’s death. In fact, this act is aimed at preserving one’s life and to make the aggressor powerless. Thus, it is a good act" - Thomas Aquinas
5 years 28 weeks ago, 1:16 PM

Reaper308

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Polygonal Rifling

Polygonal Barrels will still leave distinct markings. TXLUCKYGUY can weight in on this one...

"Proelium Comminus Auctoritate" "Sometimes the light at the end of the tunnel is a muzzle flash."
5 years 28 weeks ago, 1:22 PM

Ishootdaily

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True that

Very true on the striations, though if you shot Wad Cutters it would pretty much negate any attempt at ballistic matching, once you've cleaned the barrel.. Then again it would leave lots of the bullet in the barrel and after deformation there probably wouldn't be much of anything to match.

No sir, he fell into that bullet... Never argue with a stupid person. They'll just drag you down to their level and beat you with experience!!
5 years 28 weeks ago, 3:41 AM

paint2ride

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I'm going to use a hollow point. Hopefully there wont any thing left to match. The rifling marks will be smashed to shit.

5 years 28 weeks ago, 5:14 AM

Shakleford

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so it really doesn't concern me if a bullet can be matched to my Glock.

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5 years 28 weeks ago, 6:59 AM

runawaygun762

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Although it doesn't exist. You can't match a bullet to a particular gun with anything beyond a reasonable doubt. paint2ride, JHP rounds don't come apart. If you want something to completely come apart (most of the time), go with frangible ammo. Like shak, I don't intend to murder anyone with my Glock (That's what the M4 is for), so I don't care.

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5 years 28 weeks ago, 5:20 PM

HecklerKoch45

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Some JHP will separate

Actually a lot of JHP will have some of that. Most of them will have separation of the copper from the lead. Also, ive seen a lot of corbon rounds that are copper solid break into pieces on impact, not on purpose probably but it happens a lot. Will they break and scatter like bird shot or buck shot, no but they will often times separate into two parts, copper jacket, and lead slug non intentionally of course but they do a lot of times. The bonded JHP will not. The bonded ones are intended to stay together for ease of passing through car doors, and glass etc.

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5 years 28 weeks ago, 1:01 PM

mattitude

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I think if you are using your firearm in a legal manner you don't have to worry about ballistic fingerprinting anyway. But it is amazing how little of an original bullet they need in order to make match. Even smooth bore weapons can leave particular "tool marks" on casings and slugs. Shot on the other hand would likely be near impossible to match to a specific weapon.

"...one is allowed to resist against the unjust aggressor to one's life [...] even 'til the aggressor’s death. In fact, this act is aimed at preserving one’s life and to make the aggressor powerless. Thus, it is a good act" - Thomas Aquinas

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