Barrel extensions

[Felinis]

I am trying to extend the barrels of some of my CO2 pistols. I can't use metal tubing to extend 5.5" barrels to 10" because metal tubing is not rifled.

But what if the tubing were placed before the original rifled barrel. Wouldn't the pellet start spinning just the same once it hit the final rifled section?

 

[Long_Gun_Dallas]

Yes. But fit would need to be very precise. And even then, the chances of it being accurate are probably not great. On the other hand, I'd prefer an extension that threads onto the end of the barrel, but has a large enough ID for the pellet to pass thru without coming into contact with it. Or simply a longer barrel.

 

[Felinis]

Yes. But fit would need to be very precise. And even then, the chances of it being accurate are probably not great. On the other hand, I'd prefer an extension that threads onto the end of the barrel, but has a large enough ID for the pellet to pass thru without coming into contact with it. Or simply a longer barrel.

But a larger ID would leak gas around the pellet and ruin the advantage of the longer barrel.

My idea is to butt the two barrels together with a tight connecting sleeve or outer barrel. Perhaps with an O-ring between them.

Most short barrels are too stubby to attach a suppressor adaptor to. The outer barrel could be long enough to accept a slide-on adapter to attach a suppressor to.

 

[iAMzehTOASTY1]

I am trying to extend the barrels of some of my CO2 pistols. I can't use metal tubing to extend 5.5" barrels to 10" because metal tubing is not rifled.

But what if the tubing were placed before the original rifled barrel. Wouldn't the pellet start spinning just the same once it hit the final rifled section?

I'd say you would want it to spin first, then have the extension.
I've never heard of this type of mod, please keep up posted with results

 

[Northwoods22]

The concept of a gun barrel with a smoothbore that transitions into rifling has been done before, so the idea on its face is doable. The Holland and Holland Paradox Gun uses a smoothbore barrel with a few inches of rifling at the muzzle end. It's meant to be able to fire both shot shells and solid bullets with a usable degree of accuracy.

But the H&H are made from the beginning as one piece barrels. As has been mentioned, joining two barrel sections would require a fair degree of precision. I think your idea of an outer sleeve to connect the two sections is feasible. However, I'd be more inclined to get some already bored and rifled barrel stock/liner and have your longer barrels fabricated from that.

 

[MikeVV]

Just find and buy a...barrel slightly longer than you want and have it machined to fit the frame that you have...simple.

This is the ONLY way that you will keep speed AND accuracy without spending a LOT of money. You can...use a smooth bore tube, but it would need to be a precise bore diameter to...as you say, keep the gas pressure...behind the pellet, then proper machining to blend into the rifling so the pellet doesn't loose stability. Then PRECISELY...vacuum braze the two tubes together, using long machined shoulders to keep the two tubes properly aligned.
Easy...

Mike

 

[Long_Gun_Dallas]

I believe motorhead did make a two piece barrel that was rifling first and smoothbore after and it did work. Fx made the old smooth twist barrels that are smooth then rifled. Both are doable. Just a question of how it will be done and how it will play out.

 

[Savagefox]

I have done it with a Gamo p-25 years ago (Internally, the same has the p-85) thanks to the power of 3d printing.

I replace the plastic barrel cover with a custom one with treaded end, and made a barrel extension using a barrel from another broken Co2 pistol + a silencer at the end, respecting the overall length of the gun.

The results are better than expected, the fps skyrocketed to 650, around 6 joule, and the precision at long distances improved. I have literally 0 problems.


About using diferent barrels (the ones I used are basically the same) they may not have the same exact diamether, maybe the pellet has been sligtly deformed to fit the first one, and then entering the other with different diameter, starts rackling and become unstable, about a smooth one first, when the pellet reaches the rifled one, it will have already velocity so it may not catch the grooves as eficiently, it may just be damaged by them. The better would be to connect near identical rifled barrels. Gamo sells crappy pistol barrels at the price of peanuts.

Rifled, 8 inch pistol barrel (tacticool versions of the gun, the silencer is fake and just to cover the larger barrel, it would be SO MUCH BETTER if they turn it to a detachable extension as I did... but they are cheap and lazy)

CAÑÓN PT-80 TACTICAL

Si necesita alguna pieza que no tenemos en la lista por favor póngase en contacto con nosotros a través del siguiente enlace indicando las referencias que necesita: Formulario de contacto

www.aceros-de-hispania.com

cañon pt-80 tactical

cañon,pt-80 tactical,26020,repuestos,repuestos gamo,repuestos airecomprimido, spare parts,spare parts roe airecomprimido parts,pièces détachées

adeportes.es

And you have the normal lenght ones, also rifled:

CAÑÓN CAL. 4,5 PT-80

Si necesita alguna pieza que no tenemos en la lista por favor póngase en contacto con nosotros a través del siguiente enlace indicando las referencias que necesita: Formulario de contacto

www.aceros-de-hispania.com

Some barrel models are NOT rifled, you must check if the gun is a pellet or a bb one, the pt-80 is rifled.

 

[Nattboy]

Check out the DIANA CHASER KIT. I have one and my grand kids love it.

 

[BeMeUp]

What brand pistols, barrels aren’t that expensive for crossmans, I paid under $25 for a 10 inch to replace a 7 inch on a 2240,Lothars are like 80 for a 14 ,15 inch for crossmans

 

[Felinis]

Check out the DIANA CHASER KIT. I have one and my grand kids love it.

I already have one.

 

[Felinis]

View attachment 365495


I have done it with a Gamo p-25 years ago (Internally, the same has the p-85) thanks to the power of 3d printing.

I replace the plastic barrel cover with a custom one with treaded end, and made a barrel extension using a barrel from another broken Co2 pistol + a silencer at the end, respecting the overall length of the gun.

The results are better than expected, the fps skyrocketed to 650, around 6 joule, and the precision at long distances improved. I have literally 0 problems.


About using diferent barrels (the ones I used are basically the same) they may not have the same exact diamether, maybe the pellet has been sligtly deformed to fit the first one, and then entering the other with different diameter, starts rackling and become unstable, about a smooth one first, when the pellet reaches the rifled one, it will have already velocity so it may not catch the grooves as eficiently, it may just be damaged by them. The better would be to connect near identical rifled barrels. Gamo sells crappy pistol barrels at the price of peanuts.

Rifled, 8 inch pistol barrel (tacticool versions of the gun, the silencer is fake and just to cover the larger barrel, it would be SO MUCH BETTER if they turn it to a detachable extension as I did... but they are cheap and lazy)

CAÑÓN PT-80 TACTICAL

Si necesita alguna pieza que no tenemos en la lista por favor póngase en contacto con nosotros a través del siguiente enlace indicando las referencias que necesita: Formulario de contacto

www.aceros-de-hispania.com

cañon pt-80 tactical

cañon,pt-80 tactical,26020,repuestos,repuestos gamo,repuestos airecomprimido, spare parts,spare parts roe airecomprimido parts,pièces détachées

adeportes.es

And you have the normal lenght ones, also rifled:

CAÑÓN CAL. 4,5 PT-80

Si necesita alguna pieza que no tenemos en la lista por favor póngase en contacto con nosotros a través del siguiente enlace indicando las referencias que necesita: Formulario de contacto

www.aceros-de-hispania.com

Some barrel models are NOT rifled, you must check if the gun is a pellet or a bb one, the pt-80 is rifled.

Gamo USA does not sell pistol parts, just O-rings and accessories. They stopped several years ago.

Aceros, the Spanish company you posted links to has some interesting pistol parts that would interest me. However it appears they ship to anywhere except to the U.S.A. Probably because of the Gamo U.S.A. company.