Airsoft Canada
http://triggerairsoft.com/shop/

Go Back   Airsoft Canada > Discussion > Upgrades & Modifications
Home Forums Register Gallery FAQ Calendar
Retailers Community News/Info International Retailers IRC Today's Posts

Cutting an inner barrel - Best practice?

:

Upgrades & Modifications

Reply
 
Thread Tools
Old February 27th, 2013, 17:29   #1
Rabbit
formerly FrankieCees, Remylebeau
 
Join Date: May 2010
Location: Hamilton
Cutting an inner barrel - Best practice?

Rather than buying a whole new tightbore I figured id cut a longer one down to size with a dremel - of course taking care of jagged edges with some light sanding.

I'm kind of questioning wether or not this would affect bb trajectory - mainly because most inner barrels have a sort of concave tapering and I have no clue what effect this has already.

Thoughts?
Rabbit is offline   Reply With Quote
Old February 27th, 2013, 17:35   #2
BrokenBird
pɹıq spɹɐʍʞɔɐq
 
Join Date: Jul 2009
Location: Repentigny
I did it many times with great success, just make sure you chamfer the end of the barrel.

BrokenBird
BrokenBird is offline   Reply With Quote
Old February 27th, 2013, 17:39   #3
Hectic
Oh we do hate you, just never felt like wasting the time to give you a user title :P
 
Hectic's Avatar
 
Join Date: Apr 2007
Location: Toronto, Ontario
A pipe cuttdr also works well just dont tighten it up much just a light grip cpl turns re tighten and so on.
I never had any issues by not tapering the inner end afterwards
__________________
Quote:
Originally Posted by m102404 View Post
Hectic....FFS start writing in coherent sentences!!!
Quote:
Originally Posted by JDoorn View Post
Thanks Hectic,
While your posts are sometimes a difficult read, you sure are helpfull
Lvl. 3 certified sniper
FinchFieldAirsoft
Hectic is offline   Reply With Quote
Old February 27th, 2013, 19:21   #4
KindT
 
KindT's Avatar
 
Join Date: Aug 2012
Location: Edmonton
+1 on the pipe cutters. I have done this before on lots of thin metal piping and it works great. Just take your time and don't apply too much pressure... then use than dremel to put a chamfer in the end.
KindT is offline   Reply With Quote
Old February 27th, 2013, 19:25   #5
Hectic
Oh we do hate you, just never felt like wasting the time to give you a user title :P
 
Hectic's Avatar
 
Join Date: Apr 2007
Location: Toronto, Ontario
Can anyone explain the reason the chamfer is there (the science behind it i guess) cause ive never put it on barrels ive cut i just run the deburer thing thats on the pipe cutter and havent noticed any ill effects from not havin it
__________________
Quote:
Originally Posted by m102404 View Post
Hectic....FFS start writing in coherent sentences!!!
Quote:
Originally Posted by JDoorn View Post
Thanks Hectic,
While your posts are sometimes a difficult read, you sure are helpfull
Lvl. 3 certified sniper
FinchFieldAirsoft
Hectic is offline   Reply With Quote
Old February 27th, 2013, 19:46   #6
KindT
 
KindT's Avatar
 
Join Date: Aug 2012
Location: Edmonton
As far as I know it is just to clear out any burrs and make sure the cut portion of the barrel is still round and has not oval-ed during cutting.
KindT is offline   Reply With Quote
Old February 27th, 2013, 19:56   #7
Stealth
Mr. Silencer
 
Join Date: Dec 2001
Location: Toronto
You're supposed to actually crown the barrel in such a way that it's an increasing diameter on the last 2-4mm of the barrel.

The "science" behind it is that with an increasing diameter the air pressure differential between the barrel and the outside air is less severe.
Stealth is offline   Reply With Quote
Old February 27th, 2013, 20:02   #8
Hectic
Oh we do hate you, just never felt like wasting the time to give you a user title :P
 
Hectic's Avatar
 
Join Date: Apr 2007
Location: Toronto, Ontario
I see. I dont think it makes much of a difference in airsoft as far as i can research it doesnt even make much/any difference in real guns either as some have this and some dont alot of the reasons i read are to protect rifling and aid in pulling the cleaning brush back through.
As i said i havent had any ill effects from not doing it and ive cut down alot of barrels 8-10 at least.
Thanks for the explination!
__________________
Quote:
Originally Posted by m102404 View Post
Hectic....FFS start writing in coherent sentences!!!
Quote:
Originally Posted by JDoorn View Post
Thanks Hectic,
While your posts are sometimes a difficult read, you sure are helpfull
Lvl. 3 certified sniper
FinchFieldAirsoft
Hectic is offline   Reply With Quote
Old February 27th, 2013, 20:26   #9
Schoolboy
 
Schoolboy's Avatar
 
Join Date: Jun 2010
Location: Vancouver
You can do it with a hack saw and a clamp with a razor blade.
Be sure not to over tighten the clamp and use the hack saw to cut through once thats finished you can crown the inner part, be sure not to scratch the inner barrel, then proseed to clean it out after.
__________________
Legion XIII
Schoolboy is offline   Reply With Quote
Old February 27th, 2013, 21:05   #10
Stealth
Mr. Silencer
 
Join Date: Dec 2001
Location: Toronto
Okay whoa wait a minute.

What barrel are you cutting exactly? Because if you're cutting a Madbull or any kind of coated barrel you're going to crack the coating on it.
If it's a steel barrel, good luck using a hacksaw on that.
And if it's brass you're going to want to stabilize the barrel completely before cutting it to prevent warping as it's quite a bit softer than other barrels.

Last edited by Stealth; February 27th, 2013 at 21:07..
Stealth is offline   Reply With Quote
Old February 27th, 2013, 21:50   #11
Hectic
Oh we do hate you, just never felt like wasting the time to give you a user title :P
 
Hectic's Avatar
 
Join Date: Apr 2007
Location: Toronto, Ontario
a pipe cutter a lathe or possibly a dremel tool are the "proper" ways to do it
lathe being the right way a dremel if you are handy with it will work but a pipe cutter is likely the next best way to a lathe so long as you dont crank it too tightly on soft barrels (read brass) a hack saw is a hack job and will do a poor job on most any barrel tho it can be done its not ideal
__________________
Quote:
Originally Posted by m102404 View Post
Hectic....FFS start writing in coherent sentences!!!
Quote:
Originally Posted by JDoorn View Post
Thanks Hectic,
While your posts are sometimes a difficult read, you sure are helpfull
Lvl. 3 certified sniper
FinchFieldAirsoft
Hectic is offline   Reply With Quote
Old February 27th, 2013, 21:57   #12
Schoolboy
 
Schoolboy's Avatar
 
Join Date: Jun 2010
Location: Vancouver
I've done all three. Hack saw works but you need to be more carful. Pipe cutter wins 7fold, and Dremel works too.
__________________
Legion XIII
Schoolboy is offline   Reply With Quote
Old February 27th, 2013, 23:30   #13
Batchokookies
 
Batchokookies's Avatar
 
Join Date: Jul 2008
Location: Calgary
+1 on Stealth

To go into a bit more detail, The entire circumference of the muzzle needs to be perfectly proportional. If you have little nicks on the end of your barrel, or the bore diameter isn't "eased off" or crowned (expanding at the end, like you see on all new barrels), the gas pressure isn't evenly distributed around the bb when it leaves the barrel. In the case of burrs or shavings, they can either graze the bb on it's way out, or as I said before affect the gas pressure, both of which affect accuracy. In the case of sawing off your barrel without easing it off, even the most minute difference in barrel consistency at your muzzle will throw off the trajectory simply due to the rapid change in pressure. Even if the barrel was perfectly cut and cleaned up, the difference in accuracy between a crowned barrel and a "blunt" barrel if you will is quite dramatic.

Well at least theoretically. I doubt it will be noticable for airsoft at a hundred feet, but it sure makes a difference in a .308 at 100 yards.

Cheers
__________________
WE SCAR
TM M14
RWC G18C
KWA P226 PTP X2
VFC/UMAREX MP5A2
Batchokookies is offline   Reply With Quote
Old February 28th, 2013, 11:37   #14
Rabbit
formerly FrankieCees, Remylebeau
 
Join Date: May 2010
Location: Hamilton
I'm running an AEG with a CQB outer barrel and a custom barrel extension (roughly 2 inches) bringing me to about a 340mm - 350mm inner barrel length (roughly give or take)

I was going to cut down a Madbull Python but after reading this post looks like im better off with something steel - but again after some of these posts, not to cut it at all! (dont have the crowning tools)

Doesn't look like anything 340mm - 350mm exists premade on the market today however this Prometheus looks to be as close as i can get - however its made specifically for the Masada..it doesn't look any different? Not sure if its compatible with fitment.

http://redwolfairsoft.com/redwolf/ai..._11_5_inch.htm

Last edited by Rabbit; February 28th, 2013 at 12:07..
Rabbit is offline   Reply With Quote
ReplyTop


Go Back   Airsoft Canada > Discussion > Upgrades & Modifications

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Airsoft Canada
http://triggerairsoft.com/shop/

All times are GMT -4. The time now is 06:54.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.