What size is it?

Double Tapper · April 12th, 2008, 19:53

Does some one off hand know the stock size of a tm m16a2 barrel?.
Arnies airsoft say it is 6.07 and 510mm long.I am looking at barrels
right now and would like the next size or two down from stock.

The Saint · April 12th, 2008, 20:00

What are you trying to do?

Double Tapper · April 12th, 2008, 20:07

I would like to tighten my groups up alittle better.
I don't want to go over 390 or 400.I am shooting
372-380.I get nice range but not good hits.
Also I'll ask here so as not to create another thread.
What is the best minimum range to set up your hop-up?.

The Saint · April 13th, 2008, 02:41

I assume when you mean the next size down, you're talking about diameter. I'd recommend a Prometheus 6.03mm or KM 6.04mm tightbore. They'll increase your fps by a little bit, but shouldn't push you over 400fps.

Best minimum range to set your hopup is about 30'. Ideally, you'd set your hopup somewhere where space limitation isn't an issue.

Double Tapper · April 13th, 2008, 02:46

Thanks saint,I was looking at the 6.03Prometheus.I was worried it would put me over the 400 mark.Thanks again.

demco11 · April 13th, 2008, 08:45

Nah, tightbores dont increase your FPS that much... its a slight increase but from what your shooting it wont jump past 400, I had a discussion about this with serveal players who upgraded to a tighbore and they had a jump of 5-10 fps.

Firewalker · April 13th, 2008, 09:31

That's what I like about tightbores. Small fps leap, but rather decent accuracy and range increase. It's great. You can stay under a certain fps that way.

Disco_Dante · April 13th, 2008, 09:55

Thats a bit of a personal question isn't it?

Double Tapper · April 13th, 2008, 12:19

I was having a problem with insecurity,then a friend show me
a new product.It's called the metric system.Now I feel on
top of the world again.

mcguyver · April 13th, 2008, 12:57

Depends on the gun. M150 in either my M4 or CQBR PTW would shoot consistantly 455-460 fps with 0.25. As soon as I put the PDI barrel in the M16 (509mm), same cylinder shoots 480-490. Same BBs. All barrels are 6.04mm, but PDI is slightly under and Systema slightly over, maybe to the tune of 0.01mm difference between them.

Extra length does have it's advantages, regardless what she tells you.

Double Tapper · April 15th, 2008, 19:26

Well I had everything taken apart on my gun to clean check it over
before the big game,looks good,I also took the hop-up apart to replace
the bucking that fell out awhile back,while looking at the barrel,there
are no markings on it to tell you what size is in it.Well I'll enjoy the
new barrel when it shows up.Thanks for the help guys.

PS :I know that without the bucking piece in my shots will be slightly off.

ILLusion · April 15th, 2008, 20:37

Stock Marui M16A2 inner barrel is 6.08mm dia @ 509mm long.

Other readily available sizes on the market are 6.04mm, 6.03mm and 6.01mm.

At 509/510mm, you won't see a marked difference in velocity when tightening up the bore. Combine it with larger diameter quality BBs and you should see ~10fps increase.

Double Tapper · April 15th, 2008, 20:53

Thanks ILLusion.Are you still getting in those 8mm prowins?.

ILLusion · April 15th, 2008, 21:46

I don't plan on it. Talk to me by PM. I may be able to source one for you when I go to Hong Kong.

Double Tapper · April 15th, 2008, 22:45

Would you guys figure that a 10 inch group at 56 feet is low end
accuracy?.The hop-up is adjusted to the best I can see.

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April 12th, 2008, 19:53	#1
Double Tapper Trader rating Join Date: Jul 2006 Location: The land of the over regulated and the banners	What size is it? Does some one off hand know the stock size of a tm m16a2 barrel?. Arnies airsoft say it is 6.07 and 510mm long.I am looking at barrels right now and would like the next size or two down from stock.

April 12th, 2008, 20:00	#2
The Saint Trader rating Join Date: Jan 2005 Location: Quebec	What are you trying to do? __________________ "The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."

April 13th, 2008, 02:41	#4
The Saint Trader rating Join Date: Jan 2005 Location: Quebec	I assume when you mean the next size down, you're talking about diameter. I'd recommend a Prometheus 6.03mm or KM 6.04mm tightbore. They'll increase your fps by a little bit, but shouldn't push you over 400fps. Best minimum range to set your hopup is about 30'. Ideally, you'd set your hopup somewhere where space limitation isn't an issue. __________________ "The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."

April 12th, 2008, 20:07	#3
Double Tapper Trader rating Join Date: Jul 2006 Location: The land of the over regulated and the banners	I would like to tighten my groups up alittle better. I don't want to go over 390 or 400.I am shooting 372-380.I get nice range but not good hits. Also I'll ask here so as not to create another thread. What is the best minimum range to set up your hop-up?.

April 13th, 2008, 02:46	#5
Double Tapper Trader rating Join Date: Jul 2006 Location: The land of the over regulated and the banners	Thanks saint,I was looking at the 6.03Prometheus.I was worried it would put me over the 400 mark.Thanks again.

April 13th, 2008, 08:45	#6
demco11 Trader rating Join Date: Aug 2004 Location: Vancouver, BC	Nah, tightbores dont increase your FPS that much... its a slight increase but from what your shooting it wont jump past 400, I had a discussion about this with serveal players who upgraded to a tighbore and they had a jump of 5-10 fps.

April 13th, 2008, 09:31	#7
Firewalker Trader rating Join Date: Nov 2005 Location: Winnipeg, Manitoba	That's what I like about tightbores. Small fps leap, but rather decent accuracy and range increase. It's great. You can stay under a certain fps that way. __________________

April 13th, 2008, 09:55	#8
Disco_Dante Trader rating Join Date: Oct 2007 Location: GTA	Thats a bit of a personal question isn't it?

April 13th, 2008, 12:19	#9
Double Tapper Trader rating Join Date: Jul 2006 Location: The land of the over regulated and the banners	I was having a problem with insecurity,then a friend show me a new product.It's called the metric system.Now I feel on top of the world again. Last edited by Double Tapper; April 13th, 2008 at 13:00.. Reason: typo

April 13th, 2008, 12:57	#10
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	Depends on the gun. M150 in either my M4 or CQBR PTW would shoot consistantly 455-460 fps with 0.25. As soon as I put the PDI barrel in the M16 (509mm), same cylinder shoots 480-490. Same BBs. All barrels are 6.04mm, but PDI is slightly under and Systema slightly over, maybe to the tune of 0.01mm difference between them. Extra length does have it's advantages, regardless what she tells you. __________________ Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy.

April 15th, 2008, 19:26	#11
Double Tapper Trader rating Join Date: Jul 2006 Location: The land of the over regulated and the banners	Well I had everything taken apart on my gun to clean check it over before the big game,looks good,I also took the hop-up apart to replace the bucking that fell out awhile back,while looking at the barrel,there are no markings on it to tell you what size is in it.Well I'll enjoy the new barrel when it shows up.Thanks for the help guys. PS :I know that without the bucking piece in my shots will be slightly off.

April 15th, 2008, 20:37	#12
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	Stock Marui M16A2 inner barrel is 6.08mm dia @ 509mm long. Other readily available sizes on the market are 6.04mm, 6.03mm and 6.01mm. At 509/510mm, you won't see a marked difference in velocity when tightening up the bore. Combine it with larger diameter quality BBs and you should see ~10fps increase. __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

April 15th, 2008, 20:53	#13
Double Tapper Trader rating Join Date: Jul 2006 Location: The land of the over regulated and the banners	Thanks ILLusion.Are you still getting in those 8mm prowins?.

April 15th, 2008, 21:46	#14
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	I don't plan on it. Talk to me by PM. I may be able to source one for you when I go to Hong Kong. __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

April 15th, 2008, 22:45	#15
Double Tapper Trader rating Join Date: Jul 2006 Location: The land of the over regulated and the banners	Would you guys figure that a 10 inch group at 56 feet is low end accuracy?.The hop-up is adjusted to the best I can see.

What size is it?

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