King Arms m4a1 spring

joots · March 29th, 2013, 01:07

Hello all, I recently got a King Arms m4a1, and did a few improvements on it. My friends spare parts box contributed a lot to it, but it got a madbull tightbore barrel, a different piston head (no idea which one) and a ball bearing spring guide. We chrono'd the gun at about 370-380. I mostly play CQB though, so I need it under 350. It has the stock spring right now, and I don't know what the stock one is, so right now i'm trying to figure out which spring I should get to drop under 350 fps.

Styrak · March 29th, 2013, 01:18

An M90.

MatthewRyan · March 29th, 2013, 02:49

I get an average of 330 in my KA with a m90

ccyg8774 · March 29th, 2013, 06:06

On my King Arms M4A1 I got 330fps with a SHS M90.

joots · March 30th, 2013, 02:47

well that seems fairly definitive. I'll pick one up and try it out. Thanks! I will also try and get some photos up of this thing once I have everything all nice on it.

ccyg8774 · March 30th, 2013, 04:15

By the way... Anyone chronoed a totally stock Kingarms M4A1? I want to reuse the spring but not sure of its power.

joots · March 30th, 2013, 18:19

Forgot to do that before diving into it. but with a tightbore (6.03mm) and a better piston head, and having it shoot 370-380. I would say it was likely around 350 stock perhaps?

MatthewRyan · March 30th, 2013, 18:31

My stock spring shot at 400 fps with .2s

joots · March 30th, 2013, 18:35

400 with .2s? that seems rather fast, I was using .2s when i chrono'd too. I'm not sure how that makes sense.

ccyg8774 · March 30th, 2013, 20:06

Quote:

Originally Posted by joots

400 with .2s? that seems rather fast, I was using .2s when i chrono'd too. I'm not sure how that makes sense.

Did you turn the hop-up to minimal when you chrono'd it?
Or check the air seal around the hop-up and the new barrel?

joots · April 3rd, 2013, 17:38

an m95 spring got me 350fps +/- 1-2 with this setup.

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March 29th, 2013, 01:07	#1
joots Trader rating Join Date: Jan 2013 Location: Toronto, Ontario	King Arms m4a1 spring Hello all, I recently got a King Arms m4a1, and did a few improvements on it. My friends spare parts box contributed a lot to it, but it got a madbull tightbore barrel, a different piston head (no idea which one) and a ball bearing spring guide. We chrono'd the gun at about 370-380. I mostly play CQB though, so I need it under 350. It has the stock spring right now, and I don't know what the stock one is, so right now i'm trying to figure out which spring I should get to drop under 350 fps.

March 29th, 2013, 01:18	#2
Styrak Trader rating Join Date: Jan 2007 Location: Saskatoon, SK	An M90. __________________ Airsoft Sales and Repair/Upgrade Services

March 29th, 2013, 06:06	#4
ccyg8774 Trader rating Join Date: Jun 2012 Location: Brampton, ON	On my King Arms M4A1 I got 330fps with a SHS M90. __________________

March 29th, 2013, 02:49	#3
MatthewRyan Trader rating Join Date: Dec 2012 Location: Sudbury	I get an average of 330 in my KA with a m90

March 30th, 2013, 02:47	#5
joots Trader rating Join Date: Jan 2013 Location: Toronto, Ontario	well that seems fairly definitive. I'll pick one up and try it out. Thanks! I will also try and get some photos up of this thing once I have everything all nice on it.

March 30th, 2013, 04:15	#6
ccyg8774 Trader rating Join Date: Jun 2012 Location: Brampton, ON	By the way... Anyone chronoed a totally stock Kingarms M4A1? I want to reuse the spring but not sure of its power. __________________

March 30th, 2013, 18:19	#7
joots Trader rating Join Date: Jan 2013 Location: Toronto, Ontario	Forgot to do that before diving into it. but with a tightbore (6.03mm) and a better piston head, and having it shoot 370-380. I would say it was likely around 350 stock perhaps? Last edited by joots; March 30th, 2013 at 18:34..

March 30th, 2013, 18:31	#8
MatthewRyan Trader rating Join Date: Dec 2012 Location: Sudbury	My stock spring shot at 400 fps with .2s

March 30th, 2013, 18:35	#9
joots Trader rating Join Date: Jan 2013 Location: Toronto, Ontario	400 with .2s? that seems rather fast, I was using .2s when i chrono'd too. I'm not sure how that makes sense.

April 3rd, 2013, 17:38	#11
joots Trader rating Join Date: Jan 2013 Location: Toronto, Ontario	an m95 spring got me 350fps +/- 1-2 with this setup.

King Arms m4a1 spring

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