| Author |
Message
|
| ilovetoblowthingsup |
 Posted: 05/17/2008 21:07 PM Post subject: how small is too small for a barrel? |
 |
|
The Suppressor Man
Joined: 30 Mar 2007
Posts: 916
505.08 Spud Bux
|
hey all, i'm looking for a good quality barrel for my airsoft machine gun i'm making.
A 6mm airsoft bb is .236" in diameter, and i found aluminum tubing on mcmaster that is .2533" ID.
My only question is, is that too large to get a good accuracy rate from a vortex gun? Because with a brakeline barrel, accuracy is pretty crappy.
so i'm wondering if that's small enough to get good accuracy, or is it too small?
I mean will it be almost too small for the bb to ravel down easily?
Thanks |
|
| Back to top |
|
 |
|
|
|
| DYI |
| Posted: 05/17/2008 21:09 PM Post subject: |
|
|
Rear Brigadier
Joined: 07 Jul 2007
Posts: 2308
1164.60 Spud Bux
|
| You can get seamless SS tubing on McMaster in .243", which should be an excellent bore size. |
|
| Back to top |
|
|
| ilovetoblowthingsup |
| Posted: 05/17/2008 21:10 PM Post subject: |
|
|
The Suppressor Man
Joined: 30 Mar 2007
Posts: 916
505.08 Spud Bux
|
|
| Back to top |
|
|
| MrCrowley |
| Posted: 05/17/2008 21:16 PM Post subject: |
|
|
Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 6179
3301.19 Spud Bux
|
| I'm pretty sure 6mm BB's aren't exactly 6mm. Last I checked with my digital calipers they were about 5.87mm which is closer to .231". |
|
| Back to top |
|
|
| OuchProgramme |
| Posted: 05/17/2008 21:17 PM Post subject: |
|
|
Major
Joined: 12 Jan 2008
Posts: 373
534.55 Spud Bux
|
| Since this is an airsoft machine gun, MORE than one of the 50 persecond BB's that you'll be shooting will most likely hit the target. |
|
| Back to top |
|
|
| ilovetoblowthingsup |
| Posted: 05/17/2008 21:29 PM Post subject: |
|
|
The Suppressor Man
Joined: 30 Mar 2007
Posts: 916
505.08 Spud Bux
|
| true.. but i still want a tight-as-possible "beam" of bb's. |
|
| Back to top |
|
|
| Eddbot |
| Posted: 05/17/2008 21:31 PM Post subject: |
|
|
Major
Joined: 09 Oct 2007
Posts: 383
460.87 Spud Bux
|
I was checking out McMaster, and when searching for tubing i noticed i could change the measurements to metric, so i chose 6mm, got these 50365K321
50365K322 same pipe, the first is half a meter, second is a whole meter |
|
| Back to top |
|
|
| Hotwired |
| Posted: 05/19/2008 10:20 AM Post subject: |
|
|
UK Spudgunner
Joined: 13 Oct 2006
Posts: 1807
3910.89 Spud Bux
|
Regarding the title, my personal smallest barrel is 3mm ID 
Can still pop a hole through 1/2" planks  |
|
| Back to top |
|
|
| rcman50166 |
| Posted: 05/19/2008 10:32 AM Post subject: |
|
|
Major
Joined: 19 Jan 2008
Posts: 381
1022.10 Spud Bux
|
|
| Back to top |
|
|
| Ragnarok |
| Posted: 05/19/2008 11:22 AM Post subject: |
|
|
Lord of Karma
Joined: 19 Dec 2006
Posts: 2623
7152.99 Spud Bux
|
Like MrC said, they're usually a little under 6mm. I normally get from 5.95mm to 5.98mm, not as small has he does, but still just under 6mm.
In my opinion, for a vortex, a tight bore barrel is probably a poor idea, given that the feed is a little... vigorous, so there needs to be some gap for it to work reliably, though Neospud/MrPlow has done it with a Madbull barrel I believe.
A fairly tight barrel is however a smart idea, because it will improve muzzle velocity, reduce gas use slightly, and be a little more accurate.
In an ideal world, a barrel would have moderately wide breech end, maybe 6.4-6.5mm, which is then quickly choked down to about 6.1mm. Because the vortex might damage pellets, it's unwise to go as fine as 6.03, as jamming might occur. Not too often, perhaps once in thousands of pellets, but if you occasionally use low(er) quality pellets, it might.
.243" ID tubing should be decent for all those purposes, as the gap would be around 0.2mm, not too large. |
|
| Back to top |
|
|
| OuchProgramme |
| Posted: 05/20/2008 16:46 PM Post subject: |
|
|
Major
Joined: 12 Jan 2008
Posts: 373
534.55 Spud Bux
|
| Well you could flare out the recieving end |
|
| Back to top |
|
|
| ammosmoke |
| Posted: 05/20/2008 18:54 PM Post subject: |
|
|
Brigadier General
Joined: 27 Sep 2006
Posts: 965
1736.46 Spud Bux
|
| OuchProgramme wrote: | | Well you could flare out the recieving end |
Wouldn't doing so damage the barrel below where you have flared it out? And wouldn't this harm your accuracy? Because, if you shove a nail punch or something in there and ram it, it will cause creases. Or, if you use a dremel you will have metal shavings to clean, and an abrupt edge for the bb's to travel over. I would just get the barrel with a lower tolarance and call it good. The first one, as Ragnarok said, would probably be a good idea. |
|
| Back to top |
|
|
| Velocity |
| Posted: 05/20/2008 19:06 PM Post subject: |
|
|
Brigadier General
Joined: 07 Feb 2006
Posts: 1011
83.82 Spud Bux
|
| I bought a very nice 6mm steel barrel...but it was too tight for the crappy cheap yellow 0.12g airsoft BB's...you think if I upgraded to nicer ones, they would fit in the barrel? |
|
| Back to top |
|
|
| TurboSuper |
| Posted: 05/20/2008 20:09 PM Post subject: |
|
|
Brigadier General
Joined: 16 Jun 2005
Posts: 793
1287.29 Spud Bux
|
| I used some brake-line tubing for mine. Works perfectly. |
|
| Back to top |
|
|
| OuchProgramme |
| Posted: 05/20/2008 20:35 PM Post subject: |
|
|
Major
Joined: 12 Jan 2008
Posts: 373
534.55 Spud Bux
|
| ammosmoke wrote: | | OuchProgramme wrote: | | Well you could flare out the recieving end |
Wouldn't doing so damage the barrel below where you have flared it out? And wouldn't this harm your accuracy? Because, if you shove a nail punch or something in there and ram it, it will cause creases. Or, if you use a dremel you will have metal shavings to clean, and an abrupt edge for the bb's to travel over. I would just get the barrel with a lower tolarance and call it good. The first one, as Ragnarok said, would probably be a good idea. |
Wow..thats not how you flare out a barrel lol...
No it wouldn't harm you accuracy
Its the RECIEVING end...
flaring a pipe isn't putting a dremel through it |
|
| Back to top |
|
|
|
|
