Gas port location on groove and effect on accuracy

[lennyo3034]

What do you guys think of the location of the gas port in relation to lands and grooves and it's effect on accuracy? My concern is if the port is on a land, or worse bridging between a land and groove. Will that effect accuracy vs a port completely on a groove? My explanatory skills are lacking so if nobody has any idea of what I'm talking about, I'll try to rephrase.

 

[marduk185]

id say its a gas gun. if you dont like the precision you are seeing from it and believe the gas port location is the cause, independent from all other major and minor variables in play, then you sir are either really good or delusional as fuck.
assuming the former is the case...big assumption, buy another barrel (send the bad one to me)and see if your outcomes improve. short of that, you could lap the barrel which id think could eliminate any burs created at the port that could be defiling your precious pills as they sojourn down the barrel. i'd get a good borescope to look for that first tho, and while yer lookin thru that borescope...watch out for these people
Deee-Lite - "Groove Is In The Heart" (Official Music Video) - YouTube

 

[marduk185]

hold up yall think i stumbled on sumthin...


https://fbexternal-a.akamaihd.net/s...-kris-ford.png&cfs=1&sx=14&sy=0&sw=532&sh=278

is that the same dude in the video above on the right? red jacket groovy!

 

[DavidAR10]

I guess marduk185 would ridicule Krieger on this board if given the chance.

Krieger Barrels Inc. is known for putting the gas port "in the groove".

____________________

Gas port's location effect on accuracy? I don't know a thing about it.

But putting the gas port in the groove sure seems to be the right thing to do
with my limited knowledge of mechanics and fizzaks.

And it doesn't take the integral f(x) by separation of parts to figure that out.

 

[lennyo3034]

Thanks, I looked that up and that seems to be the case. So there may be some grounds to it. How much it affects accuracy in relation to the accuracy of a semi-auto is questionable I suppose. As we all know, some barrels just shoot better than others of the same manufacturer. I'm wondering if this is one of the reasons, and if so, how significant it is.

 

[InkedIan]

I'm sure you already know this but just to make sure you're not confused. The lands are the part of the rifling the cut into the bullet the groove is the part that should be the same diameter as the bullet(or tighter). I would think having the port in the groove would be best as it would have the least chance of deforming the bullet, but I do have accurate barrels that have the port on the land. So I'm sure the effect is minimal either way.

 

[lennyo3034]

I'm sure you already know this but just to make sure you're not confused. The lands are the part of the rifling the cut into the bullet the groove is the part that should be the same diameter as the bullet(or tighter). I would think having the port in the groove would be best as it would have the least chance of deforming the bullet, but I do have accurate barrels that have the port on the land. So I'm sure the effect is minimal either way.

You're right, I got the two mixed up in the OP. Brain fart there. I'll fix it now.

 

[Cobracutter]

It doesn't matter. Gas ports are drilled to propper spot for gas system, not for land/grove. Once a few rounds are shot, the machineing will wear away and over time, will erode.

If your worried that much, shoot a bolt gun.

 

[marduk185]

It doesn't matter. Gas ports are drilled to propper spot for gas system, not for land/grove. Once a few rounds are shot, the machineing will wear away and over time, will erode.

If your worried that much, shoot a bolt gun.

yup this eggs zachary

 

[MSTN]

It is an excellent question, one I've often wondered about, myself.

From peering down barrels with a borescope, I'd say a gas port that does not intersect the edge of a groove is far more common than one that does not.

The inside diameter of a 5.56MM barrel is approximately 0.700". With three groove rifling, the very least number of lands and grooves encountered, you'll have a land/groove junction every 0.117" or so. Given that gas ports range from 0.063", the very smallest, ever, to 0.104", the largest normally encountered, the chance of the port intersecting a land/groove junction is very high.