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First suppressed SBR.. 556 or 300blk?

This is a discussion on First suppressed SBR.. 556 or 300blk? within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Hello all. Been lurking here trying to soak up some knowledge before I make my purchase. I filled out and sent in my paperwork for ...


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Old 04-27-2016, 06:15 PM   #1
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First suppressed SBR.. 300blk build thread

Hello all. Been lurking here trying to soak up some knowledge before I make my purchase. I filled out and sent in my paperwork for my trust this morning. My ultimate goal is a 9"-11" suppressed SBR. I haven't decided yet if I should..

1.) Buy a 556 model in any barrel length, and just buy the barrel for the 300blk when I get my stamp.

2.) Buy the pistol model ** the 300blk and just wait to install the stock once the stamp comes back.

3.) Buy the SBR model and just leave it in jail at the shop till I get my stamp?

Im still a bit unsure about the 300blk due to ammo limitations (finding it/cost).

Any advice would be appreciated. As well as where to find one at a decent price. It seems what's advertised (that's actually in stock) ranges from $1400-$1900.
Specifically I'm looking for a PMCX-300B-9B-AL-PSB-FDE

The SBR at approximately 3:06 in this video has me catching some serious feelings.
http://youtu.be/Q8UWba-k18g
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Last edited by MCX300BLKSBR; 06-22-2016 at 04:44 AM.
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Old 04-27-2016, 07:03 PM   #2
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I dont know but have thought about getting a 300 blackout upper for my SIG516. I just hate waiting 4-6 months for the stamp for an sbr and suppressor.

I have no patience and 4-6 months from now i might not even want that
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Old 04-27-2016, 07:28 PM   #3
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223 vs 308

If you go with the 300 blackout you will be able, in the future to use the suppressor
on a A 10 or other 308 weapons. FWIW
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Old 04-28-2016, 03:12 AM   #4
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I have a 10.5 SBR in 556 and 8.5 in 300blk. I wouldn't bother buying a factory SBR unless you prefer not to engrave your trust on the receiver. Buy either the pistol version and add a stock (probably cheapest & easiest) or buy the rifle version and swap/cut the barrel. If you have your trust setup sign up for an efile account on the atf's website, it's usually quicker to efile your form 1.
As for suppressors I have a few 556 and 762 cans, 556 takes some of the bite out but still far from hearing safe.. Especially on an SBR. My 300blkout with a specwar 762 or tirant 45 and subsonic ammo sounds like a bb gun. .22 was my first caliber suppressor and by far the most fun to shoot suppressed, followed by 9mm sub and 300blkout sub.. 762, 6.8, 556 are all too loud to shoot without hearing protection IMO.
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Old 04-28-2016, 03:55 AM   #5
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^ What Mike said. I followed pretty much the same path.

Freedom Munitions usually has subsonic 300blk at not too crazy prices. Having said that 300blk is what finally got me to buy a reloading press.
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Old 04-28-2016, 05:19 AM   #6
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Thanks for the info guys. Looks like I'll be looking for a pistol in 300blk. Does anyone know of anyone that has them in stock? Preferably in FDE (but I know that's a long shot). I'm about to call Sig and see if they can tell me when they are shipping out the next run.

I've been scouring the Internet without much luck.
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Old 04-28-2016, 05:42 AM   #7
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Quote:
Originally Posted by MCX300BLKSBR View Post
Thanks for the info guys. Looks like I'll be looking for a pistol in 300blk. Does anyone know of anyone that has them in stock? Preferably in FDE (but I know that's a long shot). I'm about to call Sig and see if they can tell me when they are shipping out the next run.

I've been scouring the Internet without much luck.

I'm not seeing any either. But this setup would be good if you want to run both 556 and 300 blackout.. Maybe give them a call and see if they have an ETA.

Sig Sauer MCX Pistol 300 BLK 9" Alum Handguard SB15 5.56 CAK KIT
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Old 04-28-2016, 06:26 AM   #8
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I say buy your carbine in 5.56 and fill out your form 1 on it, shoot 223 until the form 1 is approved, save money and collect stuff.. then when the form is approved buy the 300 Blackout upper with an 8 or 10" barrel. ..... silencer can be bought any time. I'd just get a 30 cal and run it on the 223 also.
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Old 04-28-2016, 06:48 AM   #9
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Quote:
Originally Posted by IUOE Mike View Post
I'm not seeing any either. But this setup would be good if you want to run both 556 and 300 blackout.. Maybe give them a call and see if they have an ETA.

Sig Sauer MCX Pistol 300 BLK 9" Alum Handguard SB15 5.56 CAK KIT
I like that idea. Unfortunately they are a bit expensive when bought like that. And as you can see availability is going to be a problem. I called Sig and asked when the next run would be sent to dealers. They said they didn't know.
Quote:
Originally Posted by Moneypenny View Post
I say buy your carbine in 5.56 and fill out your form 1 on it, shoot 223 until the form 1 is approved, save money and collect stuff.. then when the form is approved buy the 300 Blackout upper with an 8 or 10" barrel. ..... silencer can be bought any time. I'd just get a 30 cal and run it on the 223 also.
I might go this route. But first I need to find one..
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Old 04-28-2016, 06:54 AM   #10
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There's a MCX pistol in 556 on Armslist in CO. It's a dealer listing

MCX Pistol 556

Looks like grabagun has them in stock in 556 and cheaper, $6 shipping.
MCX 556 Pistol

Found one in 300blk on another board, sent you a link via PM.
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Last edited by IUOE Mike; 04-28-2016 at 07:15 AM.
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Old 04-28-2016, 07:17 AM   #11
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Quote:
Originally Posted by IUOE Mike View Post
There's a MCX pistol in 556 on Armslist in CO. It's a dealer listing

MCX Pistol 556

Looks like grabagun has them in stock in 556 and cheaper, $6 shipping.
MCX 556 Pistol

Found one in 300blk on another board, sent you a link via PM.
Awesome! Thank you. I'll give these a look. I appreciate the effort.
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Old 04-28-2016, 08:54 AM   #12
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Yeah, agree that starting with a pistol is a good approach to all the formalities we have to jump through on these things. I started with 10" P516 in 223/556 because they're typically more available, and the ammo cost vs 300 is a BIG deal!!

We're now waiting on SIG's 9" 300blk caliber exchange kit for our MCX, and I've bought 1 case of 300blk at more than twice what we usually pay for 223.

Just a heads up for ya. If practical, you should try to get all the BATF stamp applications you'll need filed before July - when the ATF's new '41' rules come into effect. Since these new regs require everyone named in gun trusts to submit to background checks, the assumption is that wait times will go through the roof...

Cheers
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Old 04-28-2016, 09:25 AM   #13
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Mcx where in south Florida are you?
Palm Beach or Broward county go to Delray Shooting Center for a touch and feel experience. They have basically EVERYTHING you can possibly think about as well as configs you didn't.
Personally I went the sbr route on all my guns. A real stock and the ability to cheek it makes the world of difference.

But go check out DSC. They have 100s of guns there.

And I live in PBC. If you want to meet sometime and shoot a canned .300 or 5.56 let me know.
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Old 04-28-2016, 09:33 AM   #14
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We need a NFA section. Just saying.
Can you put in for a sbr upper prior to actually buying the upper?
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Old 04-28-2016, 11:07 AM   #15
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We need a NFA section. Just saying.
Can you put in for a sbr upper prior to actually buying the upper?
Sure, your lower receiver is the serialized component of the rifle that's actually receiving ATF's approval. It's not really unusual to start your Form 1 before hand.

It is illegal to actually assemble the SBR before receiving the stamp. We have our MCX 9" 300blk Form 1 submitted now, while waiting on SIG to ship these caliber conversion kits.

There is something of a catch in that ATF's Form 1 asks for the barrel & over all lengths. So, you do need that info...

Cheers
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