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-   -   MCX Rattler (https://www.calguns.net/calgunforum/showthread.php?t=1437103)

1911_sfca 03-30-2018 7:11 PM

MCX Rattler
 
The Sig Sauer MCX Rattler PSB is a pistol system which can be adapted to the AR-style lower receiver with Sig's conversion kit.

Has anyone else tried adapting the MCX rattler to a self-built (SSE/bullet button) AR lower?

https://www.sigsauer.com/store/media...right-face.jpg

beanz2 03-30-2018 9:42 PM

As with anything Sig, a lot of promised products will never be released to the market. During SHOT 2016, Sig showed an AR to MCX conversion kit:


and there have been pictures floating around the web of the kit:
http://www.onpointsupply.com/images/...or_sale-19.jpg
but I've never seen an AR to Rattler conversion kit.

Don't know about the Rattler, but the MCX upper and the stock aren't hard to find, but the conversion block is vaporware:
http://soldiersystems.net/blog1/wp-c...er-440x470.jpg
I imagine the Rattler would use the same conversion block. Someone on AR15.com said without the conversion block, the recoil spring assembly would fly out after a few shots and hit you in the face.

I have read that some US special forces are getting Rattler uppers on their M4 lowers (don't ask me for a link, too lazy to look it up lol) so Sig is probably making them, just not selling them to the public.

I just bought the factory Rattler, but I imagine it was not possible to get the Rattler in CA as was not released before 1/1/2017, am I correct? Then you have to put it on an AR pistol lower unless you extend the barrel to 16".

Is still possible to build a semi auto AR pistol lower in CA?

Quiet 03-31-2018 6:31 AM

Quote:

Originally Posted by beanz2 (Post 21466436)
Is still possible to build a semi auto AR pistol lower in CA?

Not legally.

1911_sfca 03-31-2018 7:04 AM

Quote:

Originally Posted by beanz2 (Post 21466436)
As with anything Sig, a lot of promised products will never be released to the market. During SHOT 2016, Sig showed an AR to MCX conversion kit:


and there have been pictures floating around the web of the kit:
http://www.onpointsupply.com/images/...or_sale-19.jpg
but I've never seen an AR to Rattler conversion kit.

Don't know about the Rattler, but the MCX upper and the stock aren't hard to find, but the conversion block is vaporware:
http://soldiersystems.net/blog1/wp-c...er-440x470.jpg
I imagine the Rattler would use the same conversion block. Someone on AR15.com said without the conversion block, the recoil spring assembly would fly out after a few shots and hit you in the face.

I have read that some US special forces are getting Rattler uppers on their M4 lowers (don't ask me for a link, too lazy to look it up lol) so Sig is probably making them, just not selling them to the public.

I just bought the factory Rattler, but I imagine it was not possible to get the Rattler in CA as was not released before 1/1/2017, am I correct? Then you have to put it on an AR pistol lower unless you extend the barrel to 16".

Is still possible to build a semi auto AR pistol lower in CA?

Thanks for your info, it matches up with my research. Sig claims that the conversion kit and upper will be available some time this summer. As you mentioned, their dates don't always align, but they are already accepting pre-orders and have a part #, so that's a sign they actually intend to do it. A lot will probably hinge on how popular these are with special forces and how many orders roll in from the government prior to rolling out the conversion kits to the public.

In the past, a pistol had to be built as single-shot, and then converted to semi-auto, with bullet button. At that point the upper could be swapped for something like the rattler.

This gun was released in summer 2017 so no, you could not buy it as a single-shot exemption and convert it to semi-auto. And even if it had come out earlier, it wouldn't have been eligible for single-shot exemption since the barrel is 5.5" and SSE requires a minimum 6" barrel.

However, if you already built up a pistol under SSE and converted to semi-auto, as I did years ago, I believe you can put this Rattler upper on it and use the sig pistol brace that it comes with.

Michael777 06-24-2018 10:05 PM

I want one very badly

1911_sfca 06-27-2018 8:09 PM

Quote:

Originally Posted by Michael777 (Post 21802841)
I want one very badly

So, this arrived in the mail. Apparently it's not vaporware after all.

http://www.multihop.net/calguns/IMG_5244.jpg

caliguy93 06-27-2018 9:01 PM

Quote:

Originally Posted by 1911_sfca (Post 21815775)
So, this arrived in the mail. Apparently it's not vaporware after all.

http://www.multihop.net/calguns/IMG_5244.jpg

Sweet!

What is needed to make the upper work on a standard lower?

Anything with the lpk or lower itself. I know the conversion block is for the stock or brace.. anything else?

Michael777 06-27-2018 9:09 PM

Quote:

Originally Posted by 1911_sfca (Post 21815775)
So, this arrived in the mail. Apparently it's not vaporware after all.

http://www.multihop.net/calguns/IMG_5244.jpg

How much and where did you get it?

beanz2 06-27-2018 9:09 PM

Quote:

Originally Posted by 1911_sfca (Post 21815775)
So, this arrived in the mail. Apparently it's not vaporware after all.

http://www.multihop.net/calguns/IMG_5244.jpg

Cool! Where did you find it?

Michael777 06-28-2018 2:04 PM

I see them on gun broker for 1800

Michael777 06-28-2018 5:11 PM

Is there an AR pistol upper that looks similar to the rattler?

sigstroker 06-28-2018 9:42 PM

I don't know that it's a lot different than an MCX, other than the Virtus-MCX differences. I have an MCX and the short Blackout barrels for it are not hard to find. It's a couple inches longer than the Rattler, but a couple inches I can live with to save hundreds of dollars.

Where it makes the big difference for CA people is the folder. You guys can't have folders on rifles, but you can on pistols, I assume. I would imagine a folding brace is available or can be cobbled up.

WRT just a plain AR upper, not including the buffer tube, my plain old Blackout AR pistol is about the same length as the Rattler. Of course, the buffer tube and brace makes it somewhat longer.

1911_sfca 06-29-2018 9:34 AM

Quote:

Originally Posted by caliguy93 (Post 21815954)
Sweet!

What is needed to make the upper work on a standard lower?

Anything with the lpk or lower itself. I know the conversion block is for the stock or brace.. anything else?

Nothing.. you just screw the conversion block into the lower, and then the upper aligns with the takedown pins. That's it!

Sig includes a trigger and hammer assembly. I asked them about it and they recommended to use it because there's a firing pin safety that needs sufficient force to be disengaged. But they said an aftermarket trigger may work, or it may give light strikes. I haven't shot it yet, so don't know.

Quote:

Originally Posted by Michael777
How much and where did you get it?

I purchased it directly from Sig Sauer a few months ago, and they told me it would ship this summer, which was exactly correct. It was in the $1700 range, don't remember the exact amount.

Quote:

Originally Posted by Michael777
Is there an AR pistol upper that looks similar to the rattler?

No. Sig's MCX system includes the buffer spring inside the upper, so there's no buffer tube portruding from the rear of the lower. I haven't seen anything quite like it. Here is a photo of it, assembled. Still waiting for Sig to release the pistol grip shown on their web site..will install that, and then it'll be complete.

http://www.multihop.net/calguns/IMG_5256.jpg

1911_sfca 06-29-2018 9:43 AM

Quote:

Originally Posted by sigstroker (Post 21820311)
I don't know that it's a lot different than an MCX, other than the Virtus-MCX differences. I have an MCX and the short Blackout barrels for it are not hard to find. It's a couple inches longer than the Rattler, but a couple inches I can live with to save hundreds of dollars.

Where it makes the big difference for CA people is the folder. You guys can't have folders on rifles, but you can on pistols, I assume. I would imagine a folding brace is available or can be cobbled up.

It has a 5.5" barrel vs. the MCX Virtus pistol's 9" barrel. Also, different handguard. I remember watching a video where a Sig rep said they had re-engineered some of the innards to get it to fire more reliably with a shorter barrel and subsonic ammo, but I don't remember specifically which parts they changed out, off the top of my head. I'm sure some research could turn up the rest of the info.

Quote:

WRT just a plain AR upper, not including the buffer tube, my plain old Blackout AR pistol is about the same length as the Rattler. Of course, the buffer tube and brace makes it somewhat longer.
This pistol is 15.75" from the tip of the flash hider to the end of the conversion block. Much more compact than your typical AR pistol, which makes it particularly unique. The entire thing is shorter than an M4 rifle barrel.

Michael777 06-29-2018 2:33 PM

That thing is the bees knees

sigstroker 06-29-2018 6:16 PM

The spec I saw was 19 inches and change. The lower and upper are obviously standard AR sized, since you can put the upper on an ordinary AR lower. If I do an MCX the difference would be 1.25 inches which is in the barrel.[quote]

The length spec of 19.3" that I saw probably includes the collapsed brace. A folder would probably be an inch or two shorter.

https://www.sigsauer.com/store/media...-psb-3-pos.jpg

edit: Oh crap, I screwed up my original post that I meant to just quote.

ZirconJohn 06-29-2018 6:24 PM

I clicked this thread because I sawr 'rattler'

...obviously mean a diff'rnt kind'a rattler :)

Carry on men :patriot:

sigstroker 06-29-2018 6:36 PM

Quote:

Originally Posted by 1911_sfca (Post 21821823)
No. Sig's MCX system includes the buffer spring inside the upper, so there's no buffer tube portruding from the rear of the lower. I haven't seen anything quite like it.

I'm guessing it's not much different than an AK, or the Daewoo or AR-180 I used to have.

Quote:

Still waiting for Sig to release the pistol grip shown on their web site..will install that, and then it'll be complete.
From what I've heard that probably won't happen. There's quite a stir over that pistol grip. I don't know why some company just doesn't start making them, they could sell tons.

BajaJames83 06-29-2018 6:48 PM

oh la la I may have to get me one, what length is that barrel?

fevillago 06-29-2018 9:18 PM

Wow!!!! Nice

1911_sfca 06-30-2018 6:10 AM

Quote:

Originally Posted by BajaJames83 (Post 21824119)
oh la la I may have to get me one, what length is that barrel?

5.5"

sigstroker 06-30-2018 10:40 AM

Now you need this:

http://www.peakcase.com/peakcase-sig...iABEgLwWvD_BwE

skyscraper 06-30-2018 11:45 AM

if you just want the adapter, sign up for in stock notification here:

https://www.sigsauer.com/store/mcx-stock-adapter.html

beanz2 06-30-2018 1:04 PM

Quote:

Originally Posted by skyscraper (Post 21826467)
if you just want the adapter, sign up for in stock notification here:

https://www.sigsauer.com/store/mcx-stock-adapter.html

Thanks! Have the Rattler, but I cannot bring it into CA. Hoping for this piece to run on my PWS pistol lower once I get it registered.

1911_sfca 07-01-2018 4:19 PM

Quote:

Originally Posted by sigstroker
The spec I saw was 19 inches and change. The lower and upper are obviously standard AR sized, since you can put the upper on an ordinary AR lower. If I do an MCX the difference would be 1.25 inches which is in the barrel.

The length spec of 19.3" that I saw probably includes the collapsed brace. A folder would probably be an inch or two shorter.

Agreed, that probably includes the brace. I measured the 15.75" so I'm sure of that dimension. But may add a pistol brace at some point.

Quote:

Originally Posted by skyscraper
if you just want the adapter, sign up for in stock notification here:

https://www.sigsauer.com/store/mcx-stock-adapter.html

Nice catch, that's a versatile choice for buying an upper separately to save costs, and/or for those with a rifle lower who want to use an MCX rifle upper.

Quote:

Originally Posted by sigstroker (Post 21826254)

Haha love that! May have to avail myself of one of those cases.


Quote:

Originally Posted by sigstroker
Still waiting for Sig to release the pistol grip shown on their web site..will install that, and then it'll be complete.
From what I've heard that probably won't happen. There's quite a stir over that pistol grip. I don't know why some company just doesn't start making them, they could sell tons.

Don't worry, I'll post here when I receive it :-)

Sig says they were supposed to already be out, but for whatever reason they're not in stock yet. I am pretty convinced these will become available soon, and they'll probably sell a lot of them. The angle of the handgrip is better for a pistol application (and they look badass).

caliguy93 07-01-2018 5:55 PM

For Anyone thinking about putting this on a standard lower, the lower will need to be modified to allow the pdw brace.. also if the rattler had a charging handle it wouldn’t work but I think it’s side charging or a lot higher than a standard charging handle?

https://s33.postimg.cc/vboyu6mwf/5_C...E2098817_A.jpg

https://s33.postimg.cc/gshtstyxb/8_C...8_CE7_C290.jpg

https://s33.postimg.cc/6ifetmbmn/B83...FB954_A347.jpg

https://s33.postimg.cc/x3hxp8bfz/7_A..._DF1_D9265.jpg

https://s33.postimg.cc/b4bj21x6n/1_F...CAD0765298.jpg

1911_sfca 07-01-2018 5:58 PM

Is that the Sig brace or SB Tactical brace?

I have a Sig brace on order, but note that the disclaimer says the conversion block can't be used with a collapsible brace or stock. So I'm assuming I'm going to have to call on my friends with machine shops..

Did you get yours to work?

caliguy93 07-01-2018 6:04 PM

Quote:

Originally Posted by 1911_sfca (Post 21831631)
Is that the Sig brace or SB Tactical brace?

I have a Sig brace on order, but note that the disclaimer says the conversion block can't be used with a collapsible brace or stock. So I'm assuming I'm going to have to call on my friends with machine shops..

Did you get yours to work?

thats the sig mcx/mpx brace.

it didn't work on the standard lower unless I took a Dremel to the lower and took off some material from the buffer tower. I ended up putting it on my sig 556 swat pistol instead.

https://s31.postimg.cc/kcpdo6217/32_...240_FB58_E.jpg

https://s31.postimg.cc/i850n3v9n/5_F...0_E8_D9_BB.jpg

https://s31.postimg.cc/ua0ehbp3f/130...FD415565_B.jpg

emgee00 07-01-2018 6:29 PM

Interesting item! I like it


Sent from my iPhone using Tapatalk

sigstroker 07-01-2018 7:52 PM

I think the folding brace is better anyway. It makes the gun a bit shorter and CA people would get to unfold something after decades of denial. :)

http://www.capitolarmory.com/sig-sau...mpx-black.html

https://s14544.pcdn.co/wp-content/up...MPX_PISTOL.jpg

sigstroker 07-01-2018 8:05 PM

Oh, and in case any of you have been living under a rock, and haven't seen the coolest gun marketing video ever made...



Notice the Blackout empties hitting the ground.

MrExel17 07-01-2018 8:51 PM

I need a RATTLER in my life!

BTW anyone know where I can purchase the rattlers pistol grip?

I called Sig CS already and its not for sale.....

Thanks!

customiiguy 07-02-2018 10:43 AM

That is nice but $1700 for thr upper? Ouch

CandG 07-02-2018 10:59 AM

Holy crap, how am I just now hearing about this?!? I need one!

walmart_ar15 07-02-2018 12:20 PM

Quote:

Originally Posted by sigstroker (Post 21832102)
Oh, and in case any of you have been living under a rock, and haven't seen the coolest gun marketing video ever made...

Notice the Blackout empties hitting the ground.

Cool video. But I always have this question when watching movies like this.

Why would a clean cut, fit, white, young, military age guy, walking around in a city of any middle Eastern country not bring suspicion? :)

Riflegear 07-02-2018 1:16 PM

Quote:

Originally Posted by caliguy93 (Post 21831618)
For Anyone thinking about putting this on a standard lower, the lower will need to be modified to allow the pdw brace.. also if the rattler had a charging handle it wouldn’t work but I think it’s side charging or a lot higher than a standard charging handle?
]

The MCX upper sits higher than a standard AR upper. Hence why you need the adapter to fit the upper on the AR lower. Otherwise the recoil spring assembly would pop out.

beanz2 07-02-2018 4:53 PM

Rattler upper on an AR pistol lower:
https://i.imgur.com/KsjLf0Uh.jpg?1

The rods on SB Tactical's MPX PDW or the stock Sig Rattler brace would definitely hit the receiver part where the buffer tube threads, but relief channels probably can be made (may possibly weaken the receiver?) Or use SB Tactical's SBPDW
https://i.imgur.com/febuVvPh.jpg



I didn't cycle or shoot it in the above configuration. Just a test fit.

customiiguy 07-03-2018 8:41 AM

Nice beanz2. Is it only 300bo?

beanz2 07-03-2018 10:30 AM

Yes, only .300 BO. I'd shoot it more if it were 7.62x39.

beanz2 07-09-2018 12:06 PM

So, the AR pistol to Rattler conversion kit is now available at Osage County Guns:
http://www.osagecountyguns.com/sig-s...0-blk-tap.html
$1,649


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