Gouge in barrel land in t97

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ceilingcat

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I took my new t97 to the range yesterday, and it shoots like a dream! consistent 2.5 -3 inch groups at 100 m with iron sights and norc ammo, rapid firing is accurate and has less recoil than an ar does.. points extremely fast, and magazine changes are not that slow at all, I'm in love with this rifle. 250 rounds using couple of d&h mags, pmags, and lar mags all fed flawlessly


The bad: when cleaning my rifle I looked in the gas port from above the rifle, I found what appears to be a gouge/ nick in the land! it is almost as deep as the entire land, and granted 556 lands aren't very deep, it is still pretty significant.

from the muzzle looking down with flaslight at chamber end, it is very difficult to see unless you trace the lands to that point and there is a small _ horizontal to the land.

I am not sure if this was there when the rifle was new or if shooting it somehow chipped then land like that.. which doesn't make sense to me because my barrel should have blown up from the obstruction right? so I assume it must have been a factory tooling gouge

will this affect barrel longevity/ will the gouge get bigger over time since it is crossing the land?? I realize it may not matter much at all since it doesn't seem to affect accuracy, I would like to get some opinions on this. I don't believe I can return it to the dealer anymore, but I am not sure if it is serious enough to warrant returning it anyway

the rest of the bore is perfect


photos:

http://s277.photobucket.com/user/da...port/P1000719_zpsce29c17f.jpg.html?sort=3&o=0

http://s277.photobucket.com/user/da...port/P1000717_zps6faeb3fa.jpg.html?sort=3&o=2

P1000719_zpsce29c17f.jpg.html


P1000717_zps6faeb3fa.jpg.html
 
Probably from the 12 year old who built it went a little deep with the drill. If it shoots good, and is reliable, then don't sweat it.....remember it's Chinese QC so it's normal....for them lol
 
I AM looking through the gas port hole, not the barrel

it does look like whoever drilled the whole went a bit deep though.. just wondering if I should worry that it might get worse with shooting some how
 
If it is in the barrel, I would return the rifle. A rifle lasts a long time, and no matter how long i owned a rifle like that, I would be pissed each time I thought of the defect.

It would be a ##### to sell, too.

Call the dealer and explain the issue. better he is pissed than you.
 
Trivial, the only portion of rifling that really matters is the last inch or two as they are the last "influence" on the projectile. You say it shoots fine so don't worry about it.

Tdc
 
TDC said:
Trivial, the only portion of rifling that really matters is the last inch or two as they are the last "influence" on the projectile. You say it shoots fine so don't worry about it.

Tdc
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Judging by the picture showing the little burrs of metal where the drill had bottomed out, it could most definitely damage the projectile and cause an instability in it. The OP may not notice with Norc 5.56 ammo but if he tries to get some better groupings it could affect better quality ammo.
 
:confused:
F22_RaptoR said:
Judging by the picture showing the little burrs of metal where the drill had bottomed out, it could most definitely damage the projectile and cause an instability in it. The OP may not notice with Norc 5.56 ammo but if he tries to get some better groupings it could affect better quality ammo.
Click to expand...


admittedly, the gouge is kind of like a pitting mark in an old surplus rifle with no "burrs" really, and the photos make it look worse than it really is. Maybe I will try with better ammo to see if accuracy will get even better, but imo 2.5-3 inch groups with irons is not bad for this type of rifle

what I'm really worried is it eroding more or something when it gets higher in round count. surplus rifles with these type of marks in their bores seem to hold up just fine.. but as everyone probably knows a mark like this on a new rifle is a little upsetting:confused:
 
That's a pretty major flaw.
I've seen small Knicks in the lands just after the throat of the barrel negatively impact accuracy.
But that's like a 1/4 moa difference.
Not sure you'd notice even a big gouge like that with this type of rifle and norc ammo.

I'd return it myself.
 
ntm said:
That's a pretty major flaw.
I've seen small Knicks in the lands just after the throat of the barrel negatively impact accuracy.
But that's like a 1/4 moa difference.
Not sure you'd notice even a big gouge like that with this type of rifle and norc ammo.

I'd return it myself.
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I wonder how this works?
Usually the distributor will take the gun back and send back to the manufacture. But this is a Chinese manufacturing company we are talking about.....I do not think they will take any returns.
 
I would still take it to the distributor. They need to handle manufacturing defect since they are the one that brought it into the country.
 
Ganderite said:
If it is in the barrel, I would return the rifle. A rifle lasts a long time, and no matter how long i owned a rifle like that, I would be pissed each time I thought of the defect.

It would be a ##### to sell, too.

Call the dealer and explain the issue. better he is pissed than you.
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This^^^^^^^. See if you can exchange if with the dealer. He can deal with the distributor. I wouldn't want a defective barrel in my gun.
 
F22_RaptoR said:
Judging by the picture showing the little burrs of metal where the drill had bottomed out, it could most definitely damage the projectile and cause an instability in it. The OP may not notice with Norc 5.56 ammo but if he tries to get some better groupings it could affect better quality ammo.
Click to expand...

That's the problem with these guns (or any chinese firearm for that matter), he could send it back, get one that looks better, but shoots 5"-6" groups. Accuracy is not a warranty issue (unless there is a guaranteed accuracy claim by the manufacturer) so if he has one with a blemish that shoots 2"-3" groups....I'd be happy with that.

The bores are chrome lined, so I don't imagine the divot it will get any worst over time.
 
We're talking about a. inexpensive mass produced chi-com gun here, not a Perazzi o/u

You say you're getting 3" groups at 100yrds...?

Why mess with it.
 
One of the reasons the QC in China is where it is is because we as Western consumers accept it. If you don't return the rifle the manufacture will see that we, their customers, accept this level of quality at this price point and future products will be built to this standard. In this era of modern C&C milling their is no reason a rifle made in China can't at least meet the minimum standards of a budget US made rifle.
Additionally since most rifles in this class are subjected to higher volumes of rounds between cleanings that tool mark will in time fill with copper fowling. Who's to say it will maintain the accuracy it presently has?
Just my (cost of living adjusted and rounded up) 5cents.
 
Hitzy said:
.....
The bores are chrome lined, so I don't imagine the divot it will get any worst over time.
Click to expand...
Exactly, and if the chrome coating is compromised it may start peeling off from this point. That is why chrome plated barrels are not good for shortening.
 
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