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Sig 556R 7.62x39 Gasblock & Regulator Cap Login/Join 
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Picture of Janq
posted
I've been trying to find a 556R for sale and am not having good luck. But I've noticed 556 in 5.56x45 are far easier to locate.

http://sigforum.com/eve/forums...0601935/m/4080092574

So a crazy thought came to mind!
Why not re-barrel a '556' 5.56x45 as a 7.62x39, to create a hybrid-hybrid franken gun?

I would use ASC mags in a 'Classic' type lower with an M4 style stock, as is my 'SCM' model which has been excellent for me.

To that do any of you know to recall if the gasblock & regulator cap for the 556 was same gas port sizing as the 556R?

I've done some cursory Google queries and cannot find a definitive statement.

TY for assistance! :-)

- Janq


"Killers who are not deterred by laws against murder are not going to be deterred by laws against guns. " - Robert A. Levy
Monday, March 12, 2007 -- Op Ed -- The Washington Post
 
Posts: 499 | Registered: September 04, 2004Reply With QuoteReport This Post
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I'm still blown away by the fact that those rifles supposedly didn't sell well enough for SIG to keep making and supporting them, but still sell for what is (IMH cheap-assed O) silly amounts of money.

The barrel (and probably the feed way) would probably take some expensive work. 7.62x39 ports on other rifles (ARs and AKs alike, if I understand correctly) tend to be larger than those on 5.56s, and not just because everyone seems to prefer that 7.62x39s be slightly (to surprisingly to outrageously - friends don't let friends buy IO!) overgassed.

My WAG, FWIW, is that whoever does the work might be able to safely modify a 5.56 part for the 7.62x39. Maybe it makes sense to find a gunsmith to do the work and ask that gunsmith whether the modification can be done rather than trying to find the right factory part as a part of checking the feasibility of the project.

Beyond that, maybe check with JDI, Gatewood Supply, or Colorado Gun Sales - people who handle 551/552/553 parts - to see if they have something you can use or can point you in the right direction. Come to think of it, that may also wind up being a good way to source a barrel and they may be able to give you good guidance on port sizing. Normally I'd also suggest Numrich, but they're not exactly SIG specialists and a quick look there didn't turn up any parts you might use.

This message has been edited. Last edited by: Il Cattivo,
 
Posts: 24743 | Location: Deep in the heart of the brush country, and closing on that #&*%!?! roadrunner. Really. | Registered: February 05, 2008Reply With QuoteReport This Post
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Picture of Greymann
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My advice is wait till you find a Sig 556R.
Be aware that changing the barrel isn't
so simple. The barrel threads are not timed like a swiss, meaning the new barrel probably will need gas ports welded and new holes drilled. Then the head spacing will need attention. And you need a gunsmith with a sig 556 reciever fixture to unscrew and screw in new barrel.
You'd be better off getting a factory 556R.

Adco firearms used to work on 556's.

https://adcofirearms.com/

This message has been edited. Last edited by: Greymann,
 
Posts: 822 | Location: New Mexico | Registered: March 21, 2017Reply With QuoteReport This Post
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I checked your profile and didn't see your email address. Please contact me through the email address in my profile.
 
Posts: 551 | Registered: March 08, 2006Reply With QuoteReport This Post
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Picture of kimberkid
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quote:
Originally posted by Janq:
I've been trying to find a 556R for sale and am not having good luck. But I've noticed 556 in 5.56x45 are far easier to locate.

<snip>
- Janq

I'm guessing you haven't checked Gunbroker ... they have 2 listed as well as a Sig Sauer R556xi Factory SBR 10"
If you keep your not in a hurry you might find a SiG P556Xi 762 which is how I bought mine and then did a form 1 to SBR it



If you really want something you'll find a way ...
... if you don't you'll find an excuse.

I'm really not a "kid" anymore ... but I haven't grown up yet either Wink
 
Posts: 5321 | Registered: January 11, 2007Reply With QuoteReport This Post
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Picture of PGT
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Henry....you might want to try the M+M M10X, which is a Sig55x derivative in 7,62x39 and is currently supported unlike the Sig 556 platform.
 
Posts: 2184 | Location: Leesburg VA | Registered: December 21, 2014Reply With QuoteReport This Post
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