m120 in vfc

BUGZIE · April 29th, 2012, 22:41

i have a vfc scar-h and i have installed an M120 shs spring, i chrono'd the gun and was pushing 385 fps for the first tow attemps.then i noted it had incressd 402-416fps then to 380-390, using .25 bb's.
I was also using an 11.1 lipo.
I am just wondering if it was in the hot because it was new, and after firing 4000 bb's through it, that it may have balanced out to a nice 370-385 fps.
I have just ordered an m110 spring if the m120 spring is set on firing at 400+ fps.
thank you.

TANKMAN · April 29th, 2012, 22:54

it should decrease as you break it in. if it is at 415ish brand new it will drop to 400 soon enough. just talk to your field owner where you play and ask if you can use it with an increased MED. if not you can fire the gun so that the piston is pulled back and the spring is compressed. leave it like that for a week or 2 then check fps. it should e better. you might have to do that repeatedly until you reach your desired fps. (400 im guessing)

TANKMAN · April 29th, 2012, 22:56

also, do you have a tight bore barrel?

BUGZIE · April 29th, 2012, 23:08

the gun has a 6.o3mm barrel on it yes, wuld you think the end fps would have beem incressed because of that.

BUGZIE · April 29th, 2012, 23:09

i was always under the impression that an M120 spring would produceing an even 375-390 fps range?
shouldnt it?

BUGZIE · April 29th, 2012, 23:12

I am attempeting to have the gun's fps to be around 375-390, for outdoor use only.

TANKMAN · April 30th, 2012, 00:20

usually a gun with a 120 should be over 400. your gun doesnt have the best compression then. if you use a 110 it should be around 375-390 brand new. my friends ak has a 100 in it and it shoots at 400 fps with it. it has great compression. id probably recommend a 110, im putting one in my vfc m16. it shoots 450 with a 120 spring. im a little surprised its shooting so low. get a 110 and modify the compression and you'll have a nice shooting gun.

ceazer · April 30th, 2012, 09:41

Quote:

Originally Posted by BUGZIE

the gun has a 6.o3mm barrel on it yes, wuld you think the end fps would have beem incressed because of that.

from my experience anywhere from 5-15 fps increase after adding my tb

Gunny_McSmith · April 30th, 2012, 10:34

Sounds like you dont have the best airseal on your gun .....

I have a vfc scar-h too, and it shoots around 380fps with a madbull m110!

Killyin · April 30th, 2012, 11:51

I had my gearbox apart last night and the stock air seal nozzle is a piece of crap on my VFC M4. TONS of leak down with the piston compressed. I upgraded the internals to a Lonex piston and piston head, aluminium double o-ring cylinder head and an o-ring air seal nozzle. MASSIVE difference in air seal. I also threw an M120 spring in there and I'm hoping not to go way over on the chrono.

BUGZIE · April 30th, 2012, 19:53

Ya, i noticed that there is a slight leak around the pistion and the cylinder when i tested the compresion, i have ordered a one peice cylinder and a m110 spring, hopefully this will get me where i want to be.

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April 29th, 2012, 22:41	#1
BUGZIE Trader rating Join Date: Apr 2012 Location: MISSISSAUGA	m120 in vfc i have a vfc scar-h and i have installed an M120 shs spring, i chrono'd the gun and was pushing 385 fps for the first tow attemps.then i noted it had incressd 402-416fps then to 380-390, using .25 bb's. I was also using an 11.1 lipo. I am just wondering if it was in the hot because it was new, and after firing 4000 bb's through it, that it may have balanced out to a nice 370-385 fps. I have just ordered an m110 spring if the m120 spring is set on firing at 400+ fps. thank you.

April 29th, 2012, 22:54	#2
TANKMAN Trader rating Join Date: Jun 2011 Location: Brockville Ont.	it should decrease as you break it in. if it is at 415ish brand new it will drop to 400 soon enough. just talk to your field owner where you play and ask if you can use it with an increased MED. if not you can fire the gun so that the piston is pulled back and the spring is compressed. leave it like that for a week or 2 then check fps. it should e better. you might have to do that repeatedly until you reach your desired fps. (400 im guessing) __________________ Load Out: Primary: Modified VFC M4, Echo 1 M249 Para, Modified Magpul M4 Secondary: TM Glock 18C, TM Glock 17, KJW M9, WA M9

April 29th, 2012, 22:56	#3
TANKMAN Trader rating Join Date: Jun 2011 Location: Brockville Ont.	also, do you have a tight bore barrel? __________________ Load Out: Primary: Modified VFC M4, Echo 1 M249 Para, Modified Magpul M4 Secondary: TM Glock 18C, TM Glock 17, KJW M9, WA M9

April 29th, 2012, 23:08	#4
BUGZIE Trader rating Join Date: Apr 2012 Location: MISSISSAUGA	the gun has a 6.o3mm barrel on it yes, wuld you think the end fps would have beem incressed because of that.

April 29th, 2012, 23:09	#5
BUGZIE Trader rating Join Date: Apr 2012 Location: MISSISSAUGA	i was always under the impression that an M120 spring would produceing an even 375-390 fps range? shouldnt it?

April 29th, 2012, 23:12	#6
BUGZIE Trader rating Join Date: Apr 2012 Location: MISSISSAUGA	I am attempeting to have the gun's fps to be around 375-390, for outdoor use only.

April 30th, 2012, 00:20	#7
TANKMAN Trader rating Join Date: Jun 2011 Location: Brockville Ont.	usually a gun with a 120 should be over 400. your gun doesnt have the best compression then. if you use a 110 it should be around 375-390 brand new. my friends ak has a 100 in it and it shoots at 400 fps with it. it has great compression. id probably recommend a 110, im putting one in my vfc m16. it shoots 450 with a 120 spring. im a little surprised its shooting so low. get a 110 and modify the compression and you'll have a nice shooting gun. __________________ Load Out: Primary: Modified VFC M4, Echo 1 M249 Para, Modified Magpul M4 Secondary: TM Glock 18C, TM Glock 17, KJW M9, WA M9

April 30th, 2012, 10:34	#9
Gunny_McSmith a.k.a. Palucol Trader rating Join Date: Mar 2008 Location: MTL	Sounds like you dont have the best airseal on your gun ..... I have a vfc scar-h too, and it shoots around 380fps with a madbull m110! __________________

April 30th, 2012, 11:51	#10
Killyin Trader rating Join Date: Jan 2012 Location: Toronto, Ontario	I had my gearbox apart last night and the stock air seal nozzle is a piece of crap on my VFC M4. TONS of leak down with the piston compressed. I upgraded the internals to a Lonex piston and piston head, aluminium double o-ring cylinder head and an o-ring air seal nozzle. MASSIVE difference in air seal. I also threw an M120 spring in there and I'm hoping not to go way over on the chrono.

April 30th, 2012, 19:53	#11
BUGZIE Trader rating Join Date: Apr 2012 Location: MISSISSAUGA	Ya, i noticed that there is a slight leak around the pistion and the cylinder when i tested the compresion, i have ordered a one peice cylinder and a m110 spring, hopefully this will get me where i want to be.

m120 in vfc

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