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Some thoughts on the new PTS Mega Arms MKM


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#1 Jeffsworkshop

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Posted 28 January 2014 - 10:51 AM

The MA MKM is today available for purchase in Taiwan, and the first thing I did after taking one home was to take it apart and see what has changed from the KWA LM4.

Below will be some pictures I took of what I found interesting, and some of my thoughts...


First what I didn't like...
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Multiple sources representing PTS claimed that the metal reciever of the PTS MA will be "Hard Coat Anodised". There was not even a hint of uncertainty. as it turned out, No. It is not hard coat anodised. In fact it wasn't even anodised. The paint on the MA looks exactly like the ones applied to the KWA LM4, and certainly just as flaky. I will be arranging for mine to be anodised in the near future. The only anodised part on the gun was the keymod rail.

Also some casting imperfections on the receiver can be seen in forms of small dimples on the surface, which are trapped air bubbles during the rough casting process. Hopefully they will not affect the integrity of the receivers.


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The barrel nut on the MA is proprietary, and Yeh-Kai loves to thread-lock nuts, so without the exact tool designed to fit this nut, you can kiss the thought of upgrading the inner barrel and hop-up bucking yourself goodbye.

Now that's out of the way, the improvements.


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The triangle that attaches the pistol grip to the lower receiver is now part of the receiver, and not a separate piece that tends to cause the grip to not attach securely. The fire selector detent is now located at the correct place relative to the real steel.


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Those of you with the KWA LM4 will be please to know that the MA bolt carrier should be backward compatible. The incompatibility I claimed earlier this month seem to be the fact that there will not be different versions of the PTS MA for North America market and the rest of the world, and those with the KSC M4 will therefore have BCGs that are indeed incompatible.


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The upper receiver is now ONE PIECE!!! WOO HOOOO!!! About damn time.


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There is a joint on the outer barrel that seem to be pretty well thread locked. With enough strength, heat, and will-power, you should be able to separate the two parts of the barrel for your SBR setup.


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The Hop-Up adjust and system is the same as the LM4. The barrel extension is part of the upper receiver, and will not be removable.


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The PTS MA trigger feels lighter, with a clear second stage. However the first stage travel will need a little breaking in before it will return to its default position when you let off the trigger. The hammer seems to be identical to the LM4's.


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Not sure what this assembly is called, but it is identical to the LM4's. The bolt stop is the new version, which allows power-stroking to send the BCG home.


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The Charging Handle is identical to the LM4.


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The loading nozzle and valve assembly is very similar to the LM4's, however if you look closely, you will notice that there is a flat divider at the gas intake opening. This seems to prevent the jet valve from drooping at its resting state, as to maintain a consistent gas output volume.


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Interesting MA design, where the eject port dust cover hinge is installed from the rear of the upper receiver, and is held in place by the forward assist stay pin.


Hopefully this post is informative. The PTS Mega Arms MKM is a giant step in the right direction for the System Seven-two series of Gas Blow-Back Rifles, with all the major kinks of the old LM4 worked out. If only the receivers were indeed anodised instead of painted, included a barrel nut wrench, and include a few piece of rail section (yeah, none are included), this would have been a masterpiece.

Maybe a version of the PTS MA but "NON-MKM"? :dribble:

#2 General Pickle

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Posted 28 January 2014 - 11:32 AM

Very good information, thank you. I can't even begin to express how frustrating it is to have such a great rifle (KWA LM4 PTS) compromised by the ridiculous 7 piece upper(left, right, top, loading ramp, screws, roll pin, inner connector...). I'm certain I'm not the only one who feels that way. Anyway, do you know if the receivers are compatible? For example, putting a Magpul LM4 lower on the MA upper?

#3 BeachEMT

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Posted 28 January 2014 - 12:26 PM

Great write-up Jeff, thank you! :thumbsup: I'd also like to know about upper/lower compatibility and which internal components are steel.

#4 Jeffsworkshop

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Posted 28 January 2014 - 02:13 PM

Thanks guys, I'm inclined to say that they are not compatible with the LM4 lowers, as was mentioned a few times by the PTS crew. However I could not confirm that myself as I have no access to an US version of the KWA LM4 on hand. From the looks of the MA upper and lower, and how different they look compared to the LM4, I would agree that in my opinion they are incompatible except those parts mentioned previously.

As to what is steel and what is not, I believe everything is the same as the LM4, except for the fire selector detent which has been made out of steel instead of pot metal, a good upgrade on an heavy wear part. The forward assist, trigger, fire selector, magazine catch, charging handle, buffer retention pin, firing pin etc. are all still pot metal.

#5 BeachEMT

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Posted 28 January 2014 - 02:41 PM

I feel like a total idiot. After looking at your pictures again it's obvious the MA upper will not fit standard lowers. The rear tab is square like the RS, whereas the LM4 has a round tab like the front. It might just be a matter of shaving it round to get it to fit standard lowers.

#6 BoobieM4H

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Posted 28 January 2014 - 06:11 PM

Thank you. Awesome write up. Can't wait to get one.

Sent from my SGH-T999L using Tapatalk



#7 xKingSizex

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Posted 30 January 2014 - 12:53 PM

Thank you for the write up JeffsWorkshop. There are some absolute differences and changes made to the PTS MA model from the original LM4, but you will see some changes to the LM4 in the future as well....including the one piece upper! I don't have a timeline for the change, but you will see it in the future. Your suggestions do not go unheard.

~~~~Please note that the PTS MA will not be distributed or warrantied by KWA. All warranties, parts and questions regarding the product will need to be addressed by PTS Syndicate.~~~

#8 netpoc

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Posted 30 January 2014 - 03:05 PM

Will the one piece upper be available for seperate purchase?

#9 BeachEMT

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Posted 30 January 2014 - 06:15 PM

Thank you KingSize! That's great news. I'm assuming they will be available from the prop shop once production begins?

#10 The Nutty Professor

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Posted 31 January 2014 - 01:52 PM

When they come out with the one piece I'm sure building a ground up hot DMR

#11 xKingSizex

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Posted 31 January 2014 - 04:07 PM

Again, not much news on the one piece upper except that I'm told we will eventually get it. I'll ask for a boat load of them once they are out, so we can put it on the Pro Shop.

#12 BeachEMT

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Posted 31 January 2014 - 06:53 PM

Thank you! I'm looking forward to replacing my current receivers. Next request is more reliable mags. :D Though I don't suppose you guys with be updating the PMag, which makes me SOL. :(

#13 xKingSizex

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Posted 06 February 2014 - 09:28 AM

No Pmags...not our decision. Sorry...

#14 General Pickle

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Posted 06 February 2014 - 10:46 AM

View PostxKingSizex, on 30 January 2014 - 12:53 PM, said:

you will see some changes to the LM4 in the future as well....including the one piece upper!
That just made my day. Hell, it made my week! I await the arrival of this part with more excitement than I've had for airsoft in quite some time!

#15 Salah Ad-Din

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Posted 07 February 2014 - 02:18 AM

Jeff, thanks for your awesome work!
Yesterday I received mine and its a WORLD of improvement over my (VFC) Umarex HK416.

I have a question regarding the outer barrel: Where you able to open that mid-way thread lock?
Is the thread CW or CCW?
Actually I want to modify mine into a SBR.

THANKS.

Edited by Salah Ad-Din, 07 February 2014 - 02:40 AM.


#16 Jeffsworkshop

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Posted 08 February 2014 - 04:39 AM

View PostSalah Ad-Din, on 07 February 2014 - 02:18 AM, said:

Jeff, thanks for your awesome work!
Yesterday I received mine and its a WORLD of improvement over my (VFC) Umarex HK416.

I have a question regarding the outer barrel: Where you able to open that mid-way thread lock?
Is the thread CW or CCW?
Actually I want to modify mine into a SBR.

THANKS.

Hey Salah,

I was actually able to. The thread is CCW. Liberal amount of clamping force on the outer barrel with some heat on the joint was required for me to release the threadlock.

Good luck!

#17 Salah Ad-Din

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Posted 08 February 2014 - 09:21 AM

Yesss!
Thanks man!

With that testimony I gathered courage and tried again aggresively.
Extensive use of heat did the trick, and though I did do some minor damage to the removed portion of the barrel, the rest of the gun was unscathed.

I tried one of my [barrel extensions] and it looks awesome.
All that's left now is to find one that suits it even better, as the one i have is too thin.

I'll share some pics when it's done.

Thanks again Jeff !

Edited by xKingSizex, 10 February 2014 - 04:29 PM.


#18 Salah Ad-Din

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Posted 12 February 2014 - 09:18 AM

As promised:

Attached Files



#19 BeachEMT

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Posted 12 February 2014 - 12:11 PM

Hey Jeff, any update on getting the receivers anodized?

#20 Jeffsworkshop

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Posted 13 February 2014 - 08:48 AM

Not yet. My bolt carrier has been sent off to be parkerized and laser etched with the BCM logo. The factory surface finish for the steel bolt carrier is awfully susceptible to wear, much more so then the LM4's.  The receiver anodising however I will put on hold, and see how well the paint hold up first. My old LM4 has anodised receivers, so check that out if you want to see how it would turn out after anodising.




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