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MP7 low power bolt

mp7 low power bolt fps drop

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#1 Ced1942

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Posted 12 January 2013 - 11:06 AM

I just put a low power bolt in my MP7 and on airsoftgi, where ive buyed the bolt, it say it will lower the fps of 60-70 fps, but mine it has drop from 400 fps to 250 fps with .20! its 150 fps! not even close to the 70 fps...

Is it normal?

Thanks!

#2 R_King91303

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Posted 12 January 2013 - 11:20 AM

What temperature were you shooting the gun in? Temperature can impact the gun significantly and since this is winter we'll start there. For example, stock, my mp7 can shoot in the 400FPS range with room temp mags, @ the same room temp with a cold mag it can shot in the 345 range.


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#3 Ced1942

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Posted 12 January 2013 - 11:29 AM

 R_King91303, on 12 January 2013 - 11:20 AM, said:

What temperature were you shooting the gun in? Temperature can impact the gun significantly and since this is winter we'll start there. For example, stock, my mp7 can shoot in the 400FPS range with room temp mags, @ the same room temp with a cold mag it can shot in the 345 range.


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-2 celsius, i know it can decrease performance but 5 minute before i instal the low power bolt, it was shooting 400 fps at -2 celsius too thats why i dont understand.

Edited by Ced1942, 12 January 2013 - 11:30 AM.


#4 R_King91303

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Posted 12 January 2013 - 11:35 AM

Did you use the same mag to re-test the gun? I'd still re-test with a mag @ room temperature to rule out temperature as a culprit.


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#5 Ced1942

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Posted 12 January 2013 - 11:40 AM

 R_King91303, on 12 January 2013 - 11:35 AM, said:

Did you use the same mag to re-test the gun? I'd still re-test with a mag @ room temperature to rule out temperature as a culprit.


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Yes two time with the same mag, going to try again now just to see if it was because of this, thanks!

Back from outside, 278 fps, 266,260 etc... i was expecting like 330 fps from that low power bolt lol...

Edited by Ced1942, 12 January 2013 - 11:50 AM.


#6 R_King91303

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Posted 12 January 2013 - 01:42 PM

Well... you got close to a 30 FPS bump from yesterday with a warmer mag, the norm for 75 degrees  is 330-345 for the low power bolt. With colder temperatures (32 - 45) I would expect 300-310 FPS. To me it sounds like you could in that grey zone where it could be mechanical, could be environmental, could be a combination of both. The easiest test you could perform would be to test it indoors where it is warmer and with a room temperature mag. If you don't see a significant bump indoors, then we can start to help you troubleshoot possible mechanical problems.


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#7 Ced1942

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Posted 13 January 2013 - 11:08 AM

 R_King91303, on 12 January 2013 - 01:42 PM, said:

Well... you got close to a 30 FPS bump from yesterday with a warmer mag, the norm for 75 degrees  is 330-345 for the low power bolt. With colder temperatures (32 - 45) I would expect 300-310 FPS. To me it sounds like you could in that grey zone where it could be mechanical, could be environmental, could be a combination of both. The easiest test you could perform would be to test it indoors where it is warmer and with a room temperature mag. If you don't see a significant bump indoors, then we can start to help you troubleshoot possible mechanical problems.


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my mag and my gas were room temperatures and shooting inside, the chrony said 400 fps with the original bolt and 293, 288 with the low power one

Edit: Any help anyone please?

Edited by Ced1942, 14 January 2013 - 07:02 PM.


#8 Icurblud

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Posted 15 January 2013 - 07:20 PM

I installed the CQB bolt in my MP7 as well.  It went from 400fps to almost 300.  After using it for about 10mags the fps is now at 330ish.  I did buy the RA NPAS valve that i was going to try instead of the cqb bolt.  That valve is adjustable.  Instead i kept the CQB bolt.  I know my indoor field likes to see that on the bolt of the MP7's.  I shot it today outside, 35 degrees with a mock [barrel extension] that i got today.  First few shots were 360-370.  Then it calmed down to 340-355.    Thats using .20 and propaine.  My advise shoot some mags through it.  I was shocked at first but maybe they need to break in a little.

#9 R_King91303

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Posted 15 January 2013 - 10:21 PM

 Ced1942, on 13 January 2013 - 11:08 AM, said:


my mag and my gas were room temperatures and shooting inside, the chrony said 400 fps with the original bolt and 293, 288 with the low power one

Edit: Any help anyone please?

Yea, at this point your options are:

#1 Start examining the bolt; this problem hasn't yet been described on the boards so it's going to be hit or miss with what the problem can be.

#2 Break-in the bolt as Icurblud suggested.

#3 Submit a ticket through the help desk, they might be able to help troubleshoot it more than we can, also If you are within the 45 day warranty you can send it back to KWA and they can repair it for you free of charge if the troubleshooting doesn't fix the problem.

I'd recommend #2 then #3. # 1 is only if all other options have been explored as it WILL void the warranty.


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#10 R_King91303

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Posted 15 January 2013 - 10:24 PM

 Icurblud, on 15 January 2013 - 07:20 PM, said:

I installed the CQB bolt in my MP7 as well.  It went from 400fps to almost 300.  After using it for about 10mags the fps is now at 330ish.  I did buy the RA NPAS valve that i was going to try instead of the cqb bolt.  That valve is adjustable.  Instead i kept the CQB bolt.  I know my indoor field likes to see that on the bolt of the MP7's.  I shot it today outside, 35 degrees with a mock [barrel extension] that i got today.  First few shots were 360-370.  Then it calmed down to 340-355.    Thats using .20 and propaine.  My advise shoot some mags through it.  I was shocked at first but maybe they need to break in a little.

Do you mix your propane with silicon oil?...it could be that the bucking swelled up because of the silicon oil, so it created a tighter seal and boosted the FPS?


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#11 Icurblud

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Posted 16 January 2013 - 07:09 AM

 R_King91303, on 15 January 2013 - 10:24 PM, said:

Do you mix your propane with silicon oil?...it could be that the bucking swelled up because of the silicon oil, so it created a tighter seal and boosted the FPS?


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I do run silicon oil in my propane.  I dont put silicone in that adapter every time i fill up but probaly 2 or 3 times per 20 times filling.  In one day when i go CQB'ing in a 6 hr session i could fill that many times.  I try not to use to much silicone but i dont want to run straight propane.  As well as propane gives more fps than green gas.

#12 Ced1942

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Posted 18 January 2013 - 08:08 PM

Cant be propane i run on gg right now, ill try to put a few mag tommorow and check if the fps gone better...





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