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Posted: 4/28/2009 7:45:19 AM EDT
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I just received a barrel from J&T Distibuting. It's a chrome lined 16" M4 1x7 4150 w/ M4 feed ramps.
It seems to be nicely finished. However, when I look through the bore there are a few tiny "spots" that look like they could be irregularities in the chrome lining. I cleaned the bore thoroughly to make sure it wasn't something else in the bore. Is this a common situation with chrome lined barrels? Will these tiny bumps smooth out with shooting? The obvious concern is that they could score the bullet jackets and affect accuracy. I know that chrome lined barrels may be more irregular and slightly less accurate than non chrome lined but this seems more prominent than I would expect. Should I be concerned? Thanks for sharing your expertise. 
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I'd contact the seller and see what they say. They may want it back before you shoot it or they may want you to try it out and see if it effects anything.
Chroming, like any other industrial process, can go wrong. I wouldn't be surprised if the chromers are running their equipment hard recently. BSW |
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I called J&T and Brent said that it is not uncommon for a bit of metal to get pushed up due to drilling the gas hole.
He advised me to shoot a few rounds through it and check the bore. According to him the irregularity should be gone then. The location of the irregularity is in the middle of the barrel on top and seems to be in the right location to support this explanation. I'll have to install the barrel in a rifle to find out but this sounds reasonable to me. |
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Quoted:
yep, maybe it's just a burr of the gas port...if so it's notmal; shoot it and it will go away. Yes, it'll almost certainly "shoot out" ,but no; it's not "natural" Rather it's the sign of a cheap ass manufacturer, not willing to take the time to properly prepare a barrel for shipment. You won't find it on a Colt, Bushmaster, or other major brand producer's product. Sorry, but you guys who want the bottom end of the market to save a few bucks wil just have to risk that chunk of steel that wasn't properly removed at the time of manufacture scarring the rifling as you shoot it out. Well, that risk is somewhat reduced by the fact that it's a chromed bore.. |
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