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Fps Consistency


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#1 Nitemare

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Posted 29 April 2012 - 09:05 AM

Fields around here have a typical 400 FPS limitation on full auto weapons. My preferred field allows 450 for semi-auto only weapons (FA disabled - is there anyway to make the LM4 semi-only?)

My question is, how likely is it that the LM4 will be shooting over 400 FPS at times? I am going to be using propane, if that matters. The biggest thing will be getting through chrono. The rest of the day I'll be using .25's so my FPS will be closer to 350-370.

I'm sure temperature is also going to have an affect. In Ohio, it can get in the 90's when we play sometimes. Is that going to skyrocket the FPS past 400? Does anyone know what temperature KWA rated the FPS of the gun at?

Edited by Nitemare, 29 April 2012 - 09:05 AM.


#2 Outlaw1995

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Posted 29 April 2012 - 09:27 AM

On KWA's website they advertise the LM4 shooting 390-410 FPS. I've heard from Allizard that on a really hot day, they've seen the LM4 shoot really hot at around the 500 FPS range. We won't know these figures until we get the LM4s in our hands. I don't know how to get a fully automatic M4 to shoot semi, but it might have to do with switching out the firing selector... but we don't know anything about that until the gun actually makes its way to the market. Once a low power bolt is introduced, on a REALLY HOT DAY I could see you could be getting 350-400 fps results...

#3 Nitemare

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Posted 29 April 2012 - 10:03 AM

Up to 500 FPS? My god...

I hope they plan on releasing that bolt soon. Summer is right around the corner.

#4 R_King91303

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Posted 29 April 2012 - 10:13 AM

Since the LM4 mags are low cap, I really don't think prolonged ammo dumps will be a problem. However, I wouldn't be surprised if they (the fields) implement a higher min engagement distance with it (120-150) with a side arm being mandatory if it's shooting in the 500 FPS range.


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#5 Outlaw1995

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Posted 29 April 2012 - 11:16 AM

Remember, I have only heard reports that it is shooting 500 fps ON A VERY HOT DAY. So, we will be looking at 390-410 fps on a normal day.

#6 Nitemare

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Posted 29 April 2012 - 11:18 AM

King, that depends on how lenient the field operators want to be. Here in Ohio, they're typically very strict when it comes to safety.

Outlaw, define a "normal" day. Shooting 400 FPS in 70-80 degrees and then 500 FPS in 90 degrees seems like a steep jump if that is the case.

Edited by Nitemare, 29 April 2012 - 11:19 AM.


#7 gcw360

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Posted 29 April 2012 - 11:37 AM

Let's wait until we actually have a working production model in the hands of one of the Forum members before we speculate any further.  It's really impossible to tell without an an LM4 to test.

#8 Outlaw1995

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Posted 29 April 2012 - 11:43 AM

View Postgcw360, on 29 April 2012 - 11:37 AM, said:

Let's wait until we actually have a working production model in the hands of one of the Forum members before we speculate any further.  It's really impossible to tell without an an LM4 to test.
Sorry Greg, I was just going off of what Allen said...

#9 aaps59

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Posted 29 April 2012 - 11:55 AM

Pretty sure propane adds even more pressure, so you may see it shooting higher than 400 consistently anyways. Youll definitely want to pick up that low power bolt when it gets here.

#10 gcw360

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Posted 29 April 2012 - 12:52 PM

View PostOutlaw1995, on 29 April 2012 - 11:43 AM, said:

Sorry Greg, I was just going off of what Allen said...
No worries, I wasn't targeting my comments to you.  I rarely do Luke.  I have heard those reports too and have learned over time that things are fluid regarding production models. There's no telling where things will be once the first batch hits the streets until members like yourself get them in their hands and give us some real world numbers.

#11 Slayer750

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Posted 29 April 2012 - 02:10 PM

My MP7 shot 450 on warm days before I got the LP bolt for it, so it wouldn't surprise me too much if the LM4s shoot hot as well. However, as gcw says, lets just wait and see how things end up.

#12 Outlaw1995

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Posted 29 April 2012 - 03:32 PM

I'm considering doing something to the MP7 that I'm going to do with the LM4 to raise fps drastically. If it works with MP7, I'm definetly intergrating the same concept to the LM4.

#13 gcw360

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Posted 29 April 2012 - 03:54 PM

View PostOutlaw1995, on 29 April 2012 - 03:32 PM, said:

I'm considering doing something to the MP7 that I'm going to do with the LM4 to raise fps drastically. If it works with MP7, I'm definetly intergrating the same concept to the LM4.
I'm game....what are you considering?

#14 Slayer750

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Posted 29 April 2012 - 04:25 PM

View PostOutlaw1995, on 29 April 2012 - 03:32 PM, said:

I'm considering doing something to the MP7 that I'm going to do with the LM4 to raise fps drastically. If it works with MP7, I'm definetly intergrating the same concept to the LM4.

Wait, why do you want to raise the FPS higher? I'm already peeved that KWA guns usually have a 400 stock FPS because I think that it too high.

#15 Nitemare

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Posted 07 May 2012 - 07:06 PM

Does anyone know when the low power bolt is expected to be here? Would be nice if KWA could chime in as well.

Summer is right around the corner and I want to be able to use this gun.

#16 R_King91303

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Posted 08 May 2012 - 08:20 PM

View PostNitemare, on 07 May 2012 - 07:06 PM, said:

Does anyone know when the low power bolt is expected to be here? Would be nice if KWA could chime in as well.

Summer is right around the corner and I want to be able to use this gun.

I wouldn't be surprised if it's not as a simple fix as the MP9 / MP7 low power bolts. Realizing this is a PTR  and designed to simulate the kinetic feedback of a M4 as much as possible, it may require a whole kit to achieve a lower FPS setup; bolt & recoil spring(s).


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#17 Outlaw1995

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Posted 09 May 2012 - 06:19 AM

View PostR_King91303, on 08 May 2012 - 08:20 PM, said:



I wouldn't be surprised if it's not as a simple fix as the MP9 / MP7 low power bolts. Realizing this is a PTR  and designed to simulate the kinetic feedback of a M4 as much as possible, it may require a whole kit to achieve a lower FPS setup; bolt & recoil spring(s).

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Not sure... The gas pushing the action back will most likely be the same, while the gas going to the bb will be regulated. I think the low power bolt would just be a drop in replacement bolt.

#18 Brigg

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Posted 11 May 2012 - 11:17 PM

Just letting you guys know, I got my LM4 today and used it in a agame. it chrono'd at 350-ish with .2's. So I dont think you have to worry about your FPS being too high or any low power bolts. If anything youre going to need a High power bolt.

We chrono'd not only my gun but also some of the other ones they got in their shipment. they all were roughly the same. I for one am very happy about this, since I play mostly indoors. But there would likely need to be a modified bolt for shooting at 450FPS.

#19 Nitemare

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Posted 14 May 2012 - 04:17 PM

Called KWA today and the woman on the phone told me that they have no plans to release a bolt of any kind at this time... somewhat disappointing.

#20 Outlaw1995

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Posted 14 May 2012 - 04:39 PM

View PostNitemare, on 14 May 2012 - 04:17 PM, said:

Called KWA today and the woman on the phone told me that they have no plans to release a bolt of any kind at this time... somewhat disappointing.
From what I understand, a steel low power bolt will be too heavy for the gun to function reliably. If KWA researches an aluminum LPB or a bolt made with a lighter metal, the bolt will happen. Just give it time... for now, I guess have your dangerwerx rocket valves at the ready.




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