Popple Holes on a PCC Barrel

[Flatland Shooter]

With folks experimenting with mid-barrel comps, it got me thinking.  Has anyone tried a few Popple Holes in their 9mm barrel?

 

Put them about 6" from the chamber and you should get some results with slow powders.  That's a comparable distance from the chamber we see on most open guns and they would be close enough to the upper receiver that they will not interfere with your normal grip on the handguard.

 

Thanks.

 

 

Edited November 10, 2017 by Flatland Shooter

[bmiller]

I don't know, but I will be finding out shortly.?

[Flatland Shooter]

Excellent.  Don't keep it a secret.

[NoSteel]

With the holes that close to the chamber wouldn't you expell enough gas to have difficulty getting the bullet to leave the muzzle with enough velocity to retain accuracy / avoid tumbling??  I would think close to the Muzzle would be the ticket??

[Flatland Shooter]

12 minutes ago, NoSteel said:

With the holes that close to the chamber wouldn't you expell enough gas to have difficulty getting the bullet to leave the muzzle with enough velocity to retain accuracy / avoid tumbling??  I would think close to the Muzzle would be the ticket??

 

That's a good question.  I've read about 9mm SBR's that a 10.5" barrel is the optimum length.  That's not to say you don't get some benefit from the longer barrel but I would think the holes closer to the chamber would work the best.  That's why we got folks here on the forum that like to experiment.

 

I re-read Brian's thread on "My Light Weight Build" and saw he mentioned plans to try Popple Holes last Monday.  Here's to hoping its very successful.

[Nugget]

I haven’t seen an mid barrel comps but I have seen short barrels with a comp and a shroud pinned and welded to make it non sbr. It should work with that setup.

[bmiller]

A friend has an extra 8" barrel that he generously offered for this experiment.  Hoping to cross paths with him this weekend.  It will get a tube pinned and welded onto it.

[troupe]

If anyone can do it, Brian can.  Glad to see that you are still working at it.

[Ultimo-Hombre]

If you put holes in the barrel you’d have to open up the top of the handguard. Anything in the way of the ejected gas would act like a thrust reverser. Actually giving you more rise. 

 

I guess if if you are just doing a naked barrel or a no handguard shroud it could work. 

[bmiller]

Yep.

[Flatland Shooter]

Brian must plan on marketing those to a bunch of rednecks.  Labeled it "EXHAUST"  (and in capital letters),  

[Ultimo-Hombre]

Dang!

 

that is legit. 

[TRUBL]

Lets all re-invent the wheel here. This stuff has all been done before.....for years. Popple holes, mid barrel brakes......this is nothing new. We've been selling this stuff for months....people have been running our ported extensions on 4" thru 10.5" barrels all summer. The set up has lots of merit for sure.......more so in the MPX than in blow back, but works great.

[Ultimo-Hombre]

Was news to me, sorry I don’t get out much anymore though. 

 

I never could tell tell much difference in my open guns between holes or no holes other than the choo choo train effect on video afterwards. 

[bmiller]

32 minutes ago, TRUBL said:

Lets all re-invent the wheel here. This stuff has all been done before.....for years. Popple holes, mid barrel brakes......this is nothing new. We've been selling this stuff for months....people have been running our ported extensions on 4" thru 10.5" barrels all summer. The set up has lots of merit for sure.......more so in the MPX than in blow back, but works great.

Who said I was re-inventing anything?  I made a post about what I was going to try.     You don't offer a barrel with popple holes do you?  I doubt you were the first person to build a sleeved barrel.  

[troupe]

Great job Brian.  It is the first done in this manner on a PPC carbine that is cut into a barrel.  Keep thinking outside of the box Brian. I am not a engineer, but the design appears to be more efficient.   Everyone knows that the tighter seal around the bullet as it passes the exit hole in the barrel, or port walls, will be more efficient with scavenging the exhaust gases the way they will be directed upward by the port walls compared to a tube with very little restrictions at all.  Blow through a straw and blow through a one inch tube, which has more force ?

[bmiller]

I picked up the donor barrel for this project yesterday.  I have never seen a 12" hbar profile 9mm barrel.  I am going to put this pig on a diet!

[TRUBL]

On 11/10/2017 at 10:16 PM, bmiller said:

Who said I was re-inventing anything?  I made a post about what I was going to try.     You don't offer a barrel with popple holes do you?  I doubt you were the first person to build a sleeved barrel.  

never said you were.......and I did.....and I am not. but keep up the good work

[Patrick Scott]

I was actually thinking of popple holes just to make the gun louder for the timer

[Broncman]

Any word on this? Very interesting in a PCC.

[MikieM]

Funny you should mention Popple holes. I took my new Faxon 10.5 inch, with Taccom extension, to a local gunsmith to have it pinned and welded over. The guy assured me that they done it before.

They called the next day and said it was done and I went and picked it up. It looked great. No splatter. Very small puddle over the pin. I headed home.

A couple of miles from their shop I was at a stop light and decided to have a peek down the bore. You know, let the setting Sun glint off the shiny insides.  

Well lo and be-freakin' hold there was a glob of weld right where the guy had drilled clean through my new barrel. I made an illegal u-turn and headed back to the gun shop.

I handed it to him and asked him to look down the bore. With a sheepish look on his face he said that the boss was gone, but would make it right come Monday. He handed me back the check I had given him, and I left.

Tomorrow...

[Aircooled6racer]

1 hour ago, MikieM said:

Funny you should mention Popple holes. I took my new Faxon 10.5 inch, with Taccom extension, to a local gunsmith to have it pinned and welded over. The guy assured me that they done it before.

They called the next day and said it was done and I went and picked it up. It looked great. No splatter. Very small puddle over the pin. I headed home.

A couple of miles from their shop I was at a stop light and decided to have a peek down the bore. You know, let the setting Sun glint off the shiny insides.  

Well lo and be-freakin' hold there was a glob of weld right where the guy had drilled clean through my new barrel. I made an illegal u-turn and headed back to the gun shop.

I handed it to him and asked him to look down the bore. With a sheepish look on his face he said that the boss was gone, but would make it right come Monday. He handed me back the check I had given him, and I left.

Tomorrow...

Hello: Good thing you didn't shoot it. Thanks, Eric

[MikieM]

31 minutes ago, Aircooled6racer said:

Hello: Good thing you didn't shoot it. Thanks, Eric

 

I thought the same thing, and it will be one of the things I mention, come Monday.

[Flatland Shooter]

When he makes it right, check that there is still rifling ahead of the chamber where he ran a 3/8" bit to clean up the weld.  

[Screaminyz]

How can they really fix it besides using it as a new door stop for there shop and buying you a new barrel and extension


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