quote:

Originally posted by Blackmoon1:
New KES aftermarket stock for MPX (not sure if this has been posted previously) from SHOTSHOW 2016.

https://www.youtube.com/watch?v=JHasb31d2X8

quote:

Originally posted by Faust245:

quote:

Originally posted by Blackmoon1:
New KES aftermarket stock for MPX (not sure if this has been posted previously) from SHOTSHOW 2016.

https://www.youtube.com/watch?v=JHasb31d2X8

I think that kinda sucks. It uses a more invasive installation method. And it plain just looks horrible. Just my .02

quote:

Originally posted by CRASH_PRO:
OK, been a while since I've been on here.

First i called Sig and go the same response about the 4.5" barrel, that it would be available around March-April for about $327. I decided that was too much so i gave it to my gunsmith to chop it down to 5" for $75. I was using a TrosUSA 3 lug adapter, had it threaded in 1/2x28" and again added a 3 lug. By using this thread i saved another 0.5" from the adapter for a total saving of 3.5".

Here it is with my Griffin Revolution 9 in K form with integral 3 lug mount.


The same day i got that back, I finally got the stamp for my TM SG-2! Yay!! I know everyone was curious if that monster can would fit under the handgaurd, answer is yes! barely... I had to remove the hand stop as the screw protrudes into the handgaurd and scratched the silencer. The regular add a rail sections are fine though because of the short screws.

Here it is with the SG-2 next to a 16" barrel JRC 9mm carbine.



Of course i had to take it to the range right away to test it! Anyone remember earlier i was saying the Geissele SD-3G was working fine? not anymore... Even with the added back pressure of the silencers it was failing to reset about 1 out of 10 rounds with Lawman 147gr ammo. I switched to Fiocchi 158gr and it was about one every other magazine using my Revolution and Octane 9. I switched to the SG-2 and it seemed to be running find for another couple of mags (maybe i just got lucky? Maybe it's not silencer dependent?) and then it ran flawless for about 20 rds of low powered Emcon suppressor ammo (which is very quiet!). I was really surprised it was working with those loads and not the lawman as it's it's the hottest load of the bunch. That stuff is loud suppressed and sometimes goes super out of my 16" where none of the other 147gr i shoot will.

Before it was cut, it was VERY dirty and the action was sluggish but yet worked flawlessly with the SD-3G! After getting it back i cleaned and oiled it, and then i started having problems.

maybe due to having less back pressure with the shorter barrel i just hit that threshold of where the Geissele doesn't reset reliably anymore? I may try using a more slick oil and testing some more, but kind of sucks it's now become finicky. Might need to invest in a different trigger...

quote:

Originally posted by CRASH_PRO:
...
Of course i had to take it to the range right away to test it! Anyone remember earlier i was saying the Geissele SD-3G was working fine? not anymore... Even with the added back pressure of the silencers it was failing to reset about 1 out of 10 rounds with Lawman 147gr ammo. I switched to Fiocchi 158gr and it was about one every other magazine using my Revolution and Octane 9. I switched to the SG-2 and it seemed to be running find for another couple of mags (maybe i just got lucky? Maybe it's not silencer dependent?) and then it ran flawless for about 20 rds of low powered Emcon suppressor ammo (which is very quiet!). I was really surprised it was working with those loads and not the lawman as it's it's the hottest load of the bunch. That stuff is loud suppressed and sometimes goes super out of my 16" where none of the other 147gr i shoot will.

Before it was cut, it was VERY dirty and the action was sluggish but yet worked flawlessly with the SD-3G! After getting it back i cleaned and oiled it, and then i started having problems.

maybe due to having less back pressure with the shorter barrel i just hit that threshold of where the Geissele doesn't reset reliably anymore? I may try using a more slick oil and testing some more, but kind of sucks it's now become finicky. Might need to invest in a different trigger...

quote:

Originally posted by mpxgeek:
I was under the impression that whatever length you put on the Form 1 has to remain an option for the gun; in another words, if I put 28" on my Form 1, I can buy a 4.5" barrel but I must maintain the 8" one or the ability to make it back into the 28". Can anyone confirm this please?

quote:

Originally posted by cavscouttj:

quote:

Originally posted by CRASH_PRO:
...
Of course i had to take it to the range right away to test it! Anyone remember earlier i was saying the Geissele SD-3G was working fine? not anymore... Even with the added back pressure of the silencers it was failing to reset about 1 out of 10 rounds with Lawman 147gr ammo. I switched to Fiocchi 158gr and it was about one every other magazine using my Revolution and Octane 9. I switched to the SG-2 and it seemed to be running find for another couple of mags (maybe i just got lucky? Maybe it's not silencer dependent?) and then it ran flawless for about 20 rds of low powered Emcon suppressor ammo (which is very quiet!). I was really surprised it was working with those loads and not the lawman as it's it's the hottest load of the bunch. That stuff is loud suppressed and sometimes goes super out of my 16" where none of the other 147gr i shoot will.

Before it was cut, it was VERY dirty and the action was sluggish but yet worked flawlessly with the SD-3G! After getting it back i cleaned and oiled it, and then i started having problems.

maybe due to having less back pressure with the shorter barrel i just hit that threshold of where the Geissele doesn't reset reliably anymore? I may try using a more slick oil and testing some more, but kind of sucks it's now become finicky. Might need to invest in a different trigger...

Not sure I follow. If the bolt fully cycles and picks up the next round, the hammer has to be cocked. If you are holding back on the trigger, and then let off, you should hear the click of the disconnector release the hammer to the sear, and then you should be ready to shoot. Where in this cycle are things going awry?

Reset is *you* letting off of the trigger so the disconnecter lets go of the hammer. So "failing to reset" is confusing. Saying a trigger is short reset, means you only let off a little for it to work.

Will it consistently lock the bolt open on an empty mag? This is the basic test related to gas port size and dwell time and such.

quote:

Originally posted by AggiePhil:

quote:

Originally posted by mpxgeek:
I was under the impression that whatever length you put on the Form 1 has to remain an option for the gun; in another words, if I put 28" on my Form 1, I can buy a 4.5" barrel but I must maintain the 8" one or the ability to make it back into the 28". Can anyone confirm this please?

Not true. The Form 1 just needs to state the primary intended barrel/overall lengths but you are absolutely free to change the gun up as you see fit. Lots of times people will but the shortest they expect the gun to be but it really doesn't matter. I have several SBR lowers and swap around uppers of different lengths all the time. Hope that helps.

quote:

Originally posted by johntsi:

quote:

Originally posted by cavscouttj:

quote:

Originally posted by CRASH_PRO:
...
Of course i had to take it to the range right away to test it! Anyone remember earlier i was saying the Geissele SD-3G was working fine? not anymore... Even with the added back pressure of the silencers it was failing to reset about 1 out of 10 rounds with Lawman 147gr ammo. I switched to Fiocchi 158gr and it was about one every other magazine using my Revolution and Octane 9. I switched to the SG-2 and it seemed to be running find for another couple of mags (maybe i just got lucky? Maybe it's not silencer dependent?) and then it ran flawless for about 20 rds of low powered Emcon suppressor ammo (which is very quiet!). I was really surprised it was working with those loads and not the lawman as it's it's the hottest load of the bunch. That stuff is loud suppressed and sometimes goes super out of my 16" where none of the other 147gr i shoot will.

Before it was cut, it was VERY dirty and the action was sluggish but yet worked flawlessly with the SD-3G! After getting it back i cleaned and oiled it, and then i started having problems.

maybe due to having less back pressure with the shorter barrel i just hit that threshold of where the Geissele doesn't reset reliably anymore? I may try using a more slick oil and testing some more, but kind of sucks it's now become finicky. Might need to invest in a different trigger...

Not sure I follow. If the bolt fully cycles and picks up the next round, the hammer has to be cocked. If you are holding back on the trigger, and then let off, you should hear the click of the disconnector release the hammer to the sear, and then you should be ready to shoot. Where in this cycle are things going awry?

Reset is *you* letting off of the trigger so the disconnecter lets go of the hammer. So "failing to reset" is confusing. Saying a trigger is short reset, means you only let off a little for it to work.

Will it consistently lock the bolt open on an empty mag? This is the basic test related to gas port size and dwell time and such.

The issue mine is having with the s3g is the hammer is following the bolt back so the hammer is not reset. It loads the next round but the hammer is in the fired "not reset" position.

quote:

Originally posted by cavscouttj:

quote:

Originally posted by johntsi:

quote:

Originally posted by cavscouttj:

quote:

Originally posted by CRASH_PRO:
...
Of course i had to take it to the range right away to test it! Anyone remember earlier i was saying the Geissele SD-3G was working fine? not anymore... Even with the added back pressure of the silencers it was failing to reset about 1 out of 10 rounds with Lawman 147gr ammo. I switched to Fiocchi 158gr and it was about one every other magazine using my Revolution and Octane 9. I switched to the SG-2 and it seemed to be running find for another couple of mags (maybe i just got lucky? Maybe it's not silencer dependent?) and then it ran flawless for about 20 rds of low powered Emcon suppressor ammo (which is very quiet!). I was really surprised it was working with those loads and not the lawman as it's it's the hottest load of the bunch. That stuff is loud suppressed and sometimes goes super out of my 16" where none of the other 147gr i shoot will.

Before it was cut, it was VERY dirty and the action was sluggish but yet worked flawlessly with the SD-3G! After getting it back i cleaned and oiled it, and then i started having problems.

...

Not sure I follow. If the bolt fully cycles and picks up the next round, the hammer has to be cocked. If you are holding back on the trigger, and then let off, you should hear the click of the disconnector release the hammer to the sear, and then you should be ready to shoot. Where in this cycle are things going awry?

Reset is *you* letting off of the trigger so the disconnecter lets go of the hammer. So "failing to reset" is confusing. Saying a trigger is short reset, means you only let off a little for it to work.

Will it consistently lock the bolt open on an empty mag? This is the basic test related to gas port size and dwell time and such.

The issue mine is having with the s3g is the hammer is following the bolt back so the hammer is not reset. It loads the next round but the hammer is in the fired "not reset" position.

My S3G came with two trigger springs. You might try the other one. Other than that, call Geissele. They will take care of you.

quote:

Originally posted by mpxgeek:

quote:

Originally posted by AggiePhil:

quote:

Originally posted by mpxgeek:
I was under the impression that whatever length you put on the Form 1 has to remain an option for the gun; in another words, if I put 28" on my Form 1, I can buy a 4.5" barrel but I must maintain the 8" one or the ability to make it back into the 28". Can anyone confirm this please?

Not true. The Form 1 just needs to state the primary intended barrel/overall lengths but you are absolutely free to change the gun up as you see fit. Lots of times people will but the shortest they expect the gun to be but it really doesn't matter. I have several SBR lowers and swap around uppers of different lengths all the time. Hope that helps.

Thank you for clarifying. I am new to the whole stamp process. I submitted my first one on Dec. 23rd for the mpx and now just waiting (im)patiently.

quote:

Originally posted by SigM4:

quote:

Originally posted by mpxgeek:

quote:

Originally posted by AggiePhil:

quote:

Originally posted by mpxgeek:
I was under the impression that whatever length you put on the Form 1 has to remain an option for the gun; in another words, if I put 28" on my Form 1, I can buy a 4.5" barrel but I must maintain the 8" one or the ability to make it back into the 28". Can anyone confirm this please?

Not true. The Form 1 just needs to state the primary intended barrel/overall lengths but you are absolutely free to change the gun up as you see fit. Lots of times people will but the shortest they expect the gun to be but it really doesn't matter. I have several SBR lowers and swap around uppers of different lengths all the time. Hope that helps.

Thank you for clarifying. I am new to the whole stamp process. I submitted my first one on Dec. 23rd for the mpx and now just waiting (im)patiently.

You're correct mpxgeek. The issue here is that once registered with an 8" barrel you're free to then put shorter or longer barrels on it, but you must maintain the ability to revert it to its registered configuration. By chopping the barrel suddenly its not able to be placed back into that configuration (short of buying another 8" barrel).

AggiePhil is correct in that you're free to have alternate length barrels (or uppers as is usually the case for an AR or similar platform) after you have the stamp in hand, but that does not dissolve you of the obligation to keep the ability to revert to the registered configuration. I'm just going off memory here, but the ATF assumes the registered configuration is what the gun will spend most of its life as, regardless if you swap out uppers for something longer/shorter. Now, how they'd know that it sits in your safe 80% of the time with a 4.5" barrel vs. 8" is another issue altogether.

So in reality these are two separate issues. All that said though this is all discuss as to the letter of the law, not the practice. In practice I haven't seen or heard of any situations where someone has been prosecuted for violating this as a stand alone event, but rather it may be one that would be tacked on to other more serious charges.

quote:

Originally posted by d2randall:
Need clarification on Form 1 on MPX barrel length? MPX lists 8" barrel, but there are SIG folks saying it is actually 8.5"? So, which length do you put on a Form 1 for SBR? TIA.

quote:

Originally posted by cavscouttj:
....

quote:

Originally posted by d2randall:
Need clarification on Form 1 on MPX barrel length? MPX lists 8" barrel, but there are SIG folks saying it is actually 8.5"? So, which length do you put on a Form 1 for SBR? TIA.

Its an interchangeable barrel. ATF don't care. 8" is fine for the Form1, and if you swap to 4.5" its still an SBR, and they still don't care.

quote:

Originally posted by CRASH_PRO:

quote:

Originally posted by cavscouttj:

quote:

Originally posted by johntsi:

quote:

Originally posted by cavscouttj:

quote:

Originally posted by CRASH_PRO:
...
Of course i had to take it to the range right away to test it! Anyone remember earlier i was saying the Geissele SD-3G was working fine? not anymore... Even with the added back pressure of the silencers it was failing to reset about 1 out of 10 rounds with Lawman 147gr ammo. I switched to Fiocchi 158gr and it was about one every other magazine using my Revolution and Octane 9. I switched to the SG-2 and it seemed to be running find for another couple of mags (maybe i just got lucky? Maybe it's not silencer dependent?) and then it ran flawless for about 20 rds of low powered Emcon suppressor ammo (which is very quiet!). I was really surprised it was working with those loads and not the lawman as it's it's the hottest load of the bunch. That stuff is loud suppressed and sometimes goes super out of my 16" where none of the other 147gr i shoot will.

Before it was cut, it was VERY dirty and the action was sluggish but yet worked flawlessly with the SD-3G! After getting it back i cleaned and oiled it, and then i started having problems.

...

Not sure I follow. If the bolt fully cycles and picks up the next round, the hammer has to be cocked. If you are holding back on the trigger, and then let off, you should hear the click of the disconnector release the hammer to the sear, and then you should be ready to shoot. Where in this cycle are things going awry?

Reset is *you* letting off of the trigger so the disconnecter lets go of the hammer. So "failing to reset" is confusing. Saying a trigger is short reset, means you only let off a little for it to work.

Will it consistently lock the bolt open on an empty mag? This is the basic test related to gas port size and dwell time and such.

The issue mine is having with the s3g is the hammer is following the bolt back so the hammer is not reset. It loads the next round but the hammer is in the fired "not reset" position.

My S3G came with two trigger springs. You might try the other one. Other than that, call Geissele. They will take care of you.

He summed it up nicely. If you play with your mpx, the bolt has to go back really far too get the hammer to catch the disconnecter. It can eject and pick up a new round without "resetting".

Mine also came with 2 springs although i already have the lighter one installed. I don't see how a heavier one would help. Also per a post few pages back, Geissele doesn't recommend the 3 gun trigger for this very reason. I don't see how they could help unless they switch me trigger packs to the SSA-E.

Will it consistently lock the bolt open on an empty mag? [This is the basic test related to gas port size and dwell time and such]