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Some thoughts on the new PTS Mega Arms MKM


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#101 Jeffsworkshop

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Posted 03 April 2014 - 08:45 PM

Sneak preview of my next project...

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#102 BeachEMT

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Posted 03 April 2014 - 11:16 PM

Are you designing it to fit stock LM4 ball-shaped detents? Or just the "pointy" detent that you use?

#103 Jeffsworkshop

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Posted 04 April 2014 - 08:04 AM

Because it will be machined in such small quantity, each selector centre can be customised.

For the prototype, it will be made for the 45° point detent, as it provides the most positive selector position retention. Subsequent production will most likely be made for the round tip detent, as it requires no modification for the end user.

Because the angle of rotation from Safe to Fire is so small, touchy and un-positive position retention can be dangerous to the end user. If testing shows that no significant wilful force is required to bump the selector from Safe to Fire, the round tip detent variation will not be produced, and a modified detent will be included in the package.

This selector centre is designed for and will only be PTS Mega Arms MKM compatible. The LM4 has a much wider lower receiver dimension, and a different selector detent location.

With all the above said, the project is still in drawings. It will be machined from stainless steel, with the possibility of a polished or silver sand blasted finish. The BAD A.SS/CASS selector levers will need to be purchased separately, which this centre is designed to work with.

#104 BeachEMT

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Posted 04 April 2014 - 10:28 AM

Looks really good man. I'm very interested to see how it turns out. Unfortunately, I guess I will just have to wait until PTS releases their version. I don't plan to replace my Magpul lower anytime soon.

#105 Quincy Williams

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Posted 06 April 2014 - 12:24 PM

Hey guys i need some Help. I have the mega arms Mkm and am experiencing Fps problems. I did switch out the oring in the bcg with the harbor freight ones. I switched to the maple leaf bucking and 6.01 tight bore inner barrel Only reached 330. Originally shot at 290! .2 Indoor chrono. Green gas. Any suggestions would be greatly appreciated! !

#106 BoobieM4H

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Posted 06 April 2014 - 01:31 PM

Try an lm4 nozzle...which is different then the mkm. The mkm has a split window port and the lm4 is just one open port.

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#107 terumi56

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Posted 06 April 2014 - 02:23 PM

you'd have to use an older lm4 nozzle seeing as how the new ones they make are just like the mkm ones. Did you also seal the rear stopper as well?  just changing the orings sometimes does nothing if the rear seal is leaking. (LM4 part #76)
there is a rubber seal at this end and if its damaged it causes the gas to leak. sometimes causing very low fps. rare but it happens. some thick silicone usually solves this rather than having to buy a new part.

#108 Quincy Williams

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Posted 07 April 2014 - 06:16 AM

Any recommendations for the silicone oil wt? And i take it a new lm4 nozzle would be useless because it is the same as the mkm? I'm really sorry guys for the questions. I'm new to this and trying to get as much information as I can.

#109 Jeffsworkshop

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Posted 07 April 2014 - 10:58 AM

PTS MEGA ARMS GBBR 45° Short Throw Ambidextrous Selector



The Prototype went surprisingly well! Minor filing was needed for full functionality.

#110 terumi56

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Posted 07 April 2014 - 01:54 PM

usually 5000 wt is good enough just dont overlube if you use heavier weight  (20k+) you dont want the heavy stuff to get into the nozzle. same goes with the rest of the bcg i found too much lube actually does the opposite of what you'd expect.

#111 Rockhound117

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Posted 07 April 2014 - 06:00 PM

I don't think I would recommend anything anywhere near 5000wt, let alone 20k. I'd recommend  something between 15-30wt RC shock oil.

#112 Lost

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Posted 07 April 2014 - 06:23 PM

View PostQuincy Williams, on 07 April 2014 - 06:16 AM, said:

Any recommendations for the silicone oil wt? And i take it a new lm4 nozzle would be useless because it is the same as the mkm? I'm really sorry guys for the questions. I'm new to this and trying to get as much information as I can.
I think there is something called Murder Oil which I have seen a couple of people use. Apparently it will not swell your o-rings and it comes in different viscosities. I have seen videos where gbb users and techs recommend it. I think it was around $8 for a bottle of 2 fl. oz or 59.1 mL.

#113 Quincy Williams

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Posted 07 April 2014 - 06:51 PM

I have murder oil which I use to lube my gun. I'm concerned about sealing the rear stopper for my gas issues. Like termuni56 directed me too. So I would use silicone to seal that?

#114 terumi56

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Posted 07 April 2014 - 07:33 PM

before that inspect to see if its damaged. if there are any bad tears in the rubber re-sealing it wont do much also see how it sits in the nozzle if its lop-sided or not flush you may have other issues.

#115 Quincy Williams

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Posted 08 April 2014 - 08:01 AM

If undamaged you have any other suggestions? I can buy parts just need to figure out possible leads

#116 Jeffsworkshop

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Posted 12 April 2014 - 09:41 AM

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#117 shangeric12

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Posted 12 April 2014 - 04:04 PM

Jeff: Are you using real-steel pivot/takedown pins and real-steel magazine catch? If so, What mods did you do to get them on or are they just a drop-in fit? As for fire-selector, how did you get the BAD-CASS on there in your older pictures... or is there any chance you will be selling the 45 degree selector centre? Thanks

#118 BoobieM4H

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Posted 12 April 2014 - 07:25 PM

Wait for it....wait for it....

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#119 netpoc

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Posted 12 April 2014 - 09:37 PM

Seriously.... It's on the same page even ;)

#120 BeachEMT

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Posted 13 April 2014 - 12:56 PM

I will give him one thing; I don't think Jeff has said what pins and mag catch he's running. They definitely aren't stock and the pins look really sweet.

Edit: I've figured out who makes the pivot/take-down pins. All it takes is a little googling...

Edited by BeachEMT, 13 April 2014 - 01:01 PM.





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