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KM4 commando spring


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#1 captainkirk05

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Posted 23 September 2013 - 12:10 PM

I am curious to know the spring strength of the KM4 commando. Is it the same spring found in the older SR12 models? I am curious because after extensive testing with springs in the SR12, it would be a good reference point as to what springs would yield what fps in the commando. So is it the same spring, with the barrel length or cylinder type directly influencing the velocity each gun shoots? Or are they different springs?

#2 Chuck S

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Posted 24 September 2013 - 02:34 AM

I suspect it's sprung/cylindered like the KM4-CQB with the 10" barrel and will have a muzzle velocity under 350fps when broken in.  Seems logical from a manufacturing point to use standard, proven gearbox parts.

-- Chuck

#3 Pete

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Posted 07 October 2013 - 06:06 PM

My KM4 Commando has the M120 spring.
My son's CQR Mod1 has the same gearbox with same cylinder and spring.

Hope this helps.

#4 gcw360

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Posted 08 October 2013 - 11:14 AM

View PostPete, on 07 October 2013 - 06:06 PM, said:

My KM4 Commando has the M120 spring.
My son's CQR Mod1 has the same gearbox with same cylinder and spring.

Hope this helps.
is there any significant difference in FPS between the 2?

#5 Pete

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Posted 08 October 2013 - 11:46 AM

View Postgcw360, on 08 October 2013 - 11:14 AM, said:

is there any significant difference in FPS between the 2?
The stock Commando shoots around 340, the CQR Mod 1 with the longer barrel shoots around 315.
The small cylinder volume in both guns, causes the lower fps in the Mod 1 with the longer barrel (runs out of air to push the bb out).

Edited by Pete, 08 October 2013 - 11:47 AM.


#6 gcw360

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Posted 09 October 2013 - 11:26 AM

View PostPete, on 08 October 2013 - 11:46 AM, said:

The stock Commando shoots around 340, the CQR Mod 1 with the longer barrel shoots around 315.
The small cylinder volume in both guns, causes the lower fps in the Mod 1 with the longer barrel (runs out of air to push the bb out).
Thank you.




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