Bullet scaring in my AR-15

Predator Strikeforce

Predator Strikeforce

New member
I noticed that each bullet that I chamber into my .223 rem AR has the same scratch from the neck of the case to the ballistic tip. Does anyone know what the cause of this is and if it is normal or not. I imagine that it has to effect flight in some way.

I took a pic to show you but I'm not sure if you'll be able to see it.

image.jpg
 
If its a new AR the edges on the ramp leading into the chamber are usually pretty sharp. I had a similar problem with mine, but it eventually got worn and stopped doing it. It could be from the edge of your magazine also. If its the magazine you should be able to see where it's dragging on the lip and you can round the edges over with a file.
 
it probly for the bottom of the shell (as its in the gun)
its from when the bolt grabs the shell and it gets feed in to the chamber
try this, when the clip has shells, the bolt on the gun is back.
hit the bolt release, you'll hear 2 clicks as the bullet is chambered. the first one is when it starts into the chamber (thats where your marks are from, and some times they even get dents in the brass), then another when the bolt fully closes.
if you do the same, with out bullets you'll hear just 1 click
it's just an auto loader thing
have fun todd
 
It looks to me as though the bullet is being pushed between the breach-lugs on the barrel-extension and getting scratched. I polish the feed-ramps and between the breach-lugs on all of my builds, but it won't totally eliminate the scratches in all cases. There are certain shapes of bullets that just always seem to get some scratches.

Once the upper is assembled it is much more difficult to polish those surfaces, but it can be done. While I'm building, and have the barrel in my hands, I use a craytex, ruberized abrasive point to do the polishing. When the upper is already together, you can use fine crocus-cloth folded over a small piece of thin wood (carve a pop-cicle stick to fit) to polish between the breach-lugs. The feed-ramps you would have to use a round wooden dowel, about 3/16", wrapped with crocus-cloth.

When you are finished, make certain that you clean the chamber and bore. You don't want any abrasive residue in your chamber or bore when you shoot it!
Hope this helps.....
 
Quote:
It looks to me as though the bullet is being pushed between the breach-lugs on the barrel-extension and getting scratched. I polish the feed-ramps and between the breach-lugs on all of my builds, but it won't totally eliminate the scratches in all cases. There are certain shapes of bullets that just always seem to get some scratches.



Thanks Mike, I guess my question is, since you already polished the feed-ramps and breach-lugs on my gun when you assembeled it, does it need to be done again? Or done more? Or should I just shoot it more and see it if goes away after more use? Thanks again. LawDog
 
Sorry LawDog. I don't always put the board-names with customer names. I didn't realize I had built your gun until now! /ubbthreads/images/graemlins/blush.gif

If you look, you will see that the feed-ramps and between the lugs have already been polished. Like I said in my earlier post: You can't eliminate all of the scratches from all of the bullets. Trust me, I polish them quite well before assembly. I don't think you will be able to improve on it now. Often if you look at a bullet that has been chambered in a gun that has not been polished, the scrapes on the bullets are quite deep and nasty.
 
I've noticed the same thing in my (Dtech) 243 WSSM with 70gr SMKs, but not with 87gr V-max. Logic would say that it has to be affecting accuracy, but that's a little scary, cause scratches or not the 70s still shoot close to 1/2 MOA out at 400 YDs.
 
Get some super fine sand paper, 2000 grit from an auto parts supplier works well, and work the feed ramp in the barrel extension. You can do it while sitting there watching TV with the sand paper wrapped over a finger. It's what I did with my Bushy and it's nice a smooth now.
 


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