What Is This 22LR Barrel Damage?

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peeplwtchr

peeplwtchr

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Hi All-

I recently got a borescope, and found these circular imperfections in the bore. Can you tell me what they are due to? Do they effect accuracy or anything else?

Thanks,

Todd
 

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peeplwtchr said:
Hi All-

I recently got a borescope, and found these circular imperfections in the bore. Can you tell me what they are due to? Do they effect accuracy or anything else?

Thanks,

Todd
Click to expand...
I'd call em cleaned rust pits, as for accuracy...... I'd stick to plated bullets for fear of increased leading, no proof to support this just personal preference
 
S&W MP 15-22. I have put about 7k rounds through it, bought it new approx. 3 mos. ago. It's a tack driver for a $300 gun. I was guessing it may have been manufacturing defects, as I clean it every time I shoot it, and it has never been wet.

Will these pits effect accuracy?

BTW- The nane of the borescope is below, Works amazingly well, and plugs into your phone for power and display. I got mine on amazon for $50.

Teslong Rifle Borescope, 0.2inch Gun Barrel Bore Scope Camera with Side-View Mirror and Semi-Rigid Cable, for Windows, Mac and Android Smartphone

Thanks!
 
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I was just searching for a bore guide to fit this, zero success. The extractor appears to be the barrier. Anyone know of one?

Thanks!
 
I’ll opine with the previous poster that they were small voids in the original steel the barrel was made from. The cutting of the bore hole and rifling through the blank exposed them.

In a plinker .22 the barrel blank steel quality is far lower than a higher priced firearm, so these small imperfections may be present inside the steel blanks. I wouldn’t be surprised if the whole barrel blank lot purchased to make that batch of M&P .22’s has similar voids throughout the run.

Obviously they aren’t affecting the accuracy you are getting, nor does it look like the 7k bullets sent down the bore so far caused further damage.

I say you got a good rifle, “Shoot it until the sights fall off!”

Stay safe.
 
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Riomouse911 said:
I’ll opine with the previous poster that they were small voids in the original steel the barrel was made from. The cutting of the bore hole and rifling through the blank exposed them.

In a plinker .22 the barrel blank steel quality is far lower than a higher priced firearm, so these small imperfections may be present inside the steel blanks. I wouldn’t be surprised if the whole barrel blank lot purchased to make that batch of M&P .22’s has similar voids throughout the run.

Obviously they aren’t affecting the accuracy you are getting, nor does it look like the WW the 7k bullets sent down the bore so far caused further damage.

I Saylor got a good rifle, “Shoot it until the sights fall off!”

Stay safe.
Click to expand...


Informative and well articulated, thanks!
 
If you are curious if they are affecting accuracy, saturate a few patches with rubbing compound and spend a few hours mindlessly swabbing the bore to smooth them out. If the groups loosen up you will know that the pits were good! :(

I really like the borescope, but then I would have to get a smartphone which so far for 65 years I have avoided. :rofl:
 
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I have a rifle with really ugly tool chatter marks along the bore, yet it shoots cast and jacketed bullets with as much accuracy as I can must-read no leading or undue copper coating. There doesn't seem to be rhyme or reason in these things.
 
The voids appear to be filling with lead from the soft 22LR bullets. It's my opinion that you shouldn't scrub it so much as to get them out. They are effectively smoothing out the bore, providing a more consistent bearing surface than the void.
 
I won't worry about the defects ( ? ) .. especially without the bore scope, you never would have wondered, Lol.

A bore scope is a double edged sword...while helpful, they sometimes raises more questions then it answers.

As for moisture in the bore, while possible, I would question the consistent roundness of the pock marks.

Enjoy your "inexpensive", accurate 22.

I am curious.. what 22LR ammo do you routinely use ? That bore is very well polished, and very clean.
 
Hi-

I bought this as an AR training gun, so I push the cheapest ammo I can find - Thunderbolt. Before I get flamed for shooting it, I did accuracy tests with 8 kinds (Expensive and inexpensive relatively) of 22LR in the gun, and Thunderbolt was second in accuracy to CCI Standard Velocity @100yds. So obviously Thunderbolt is the dirtiest ammo you can shoot, so the clean bore is me being OCD about the condition of all my guns. I wish I cared less. :p. Thanks for asking though.

On a side note, I have found that buying cheap training guns for technique development has saved me loads of money spent on ammo. I use a $180 Taurus TX22 (Which I LOVE and recommend after 2k rounds), for my 9mm holster and defensive shooting training. Plus, I have more shooting options and things to tinker with. ;) I would have been very sad if I had been into shooting during the last 22lr ammo drought. :( Now I shoot 1000-1500 rounds per weekend while I can get it for 3 cents; and 100 9mm for recoil practice.
 
peeplwtchr said:
Hi-

I bought this as an AR training gun, so I push the cheapest ammo I can find - Thunderbolt. Before I get flamed for shooting it, I did accuracy tests with 8 kinds (Expensive and inexpensive relatively) of 22LR in the gun, and Thunderbolt was second in accuracy to CCI Standard Velocity @100yds. So obviously Thunderbolt is the dirtiest ammo you can shoot, so the clean bore is me being OCD about the condition of all my guns. I wish I cared less. :p. Thanks for asking though.

On a side note, I have found that buying cheap training guns for technique development has saved me loads of money spent on ammo. I use a $180 Taurus TX22 (Which I LOVE and recommend after 2k rounds), for my 9mm holster and defensive shooting training. Plus, I have more shooting options and things to tinker with. ;) I would have been very sad if I had been into shooting during the last 22lr ammo drought. :( Now I shoot 1000-1500 rounds per weekend while I can get it for 3 cents; and 100 9mm for recoil practice.
Click to expand...

The trigger time you're getting is far more important than any imperfections in your barrel.
 
That's why I don't own a bore scope. If an imperfection can't be seen by the naked eye, it's doubtful that the bullet will see it as it speeds by. If the bore leads up when shot, or becomes inaccurate, it may need to be replaced. If it doesn't, don't make a mountain out of a molehill.
 
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