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Posted: 2/6/2024 5:55:55 PM EDT
Saw one of these at a local shop. Didn’t even know they made a pistol version. Definitely pretty cool but a little heavy. Is it worth picking up? Sig doesn’t support these any more right?
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"is it worth picking up" depends on which version and what price?
"sig doesn't support" correct but they're not prone to needing parts so not a bad pickup if you understand what you're getting and the price is right. GB prices are four digits....I wouldn't pay that in 2024 for a dead-end platform when it's a US-spec only design and the gas system was prone to being unreliable due to ignoring the 553 pattern and 551 pattern and splitting the difference. Seems every cop I've talked to who was issued a Sig556 SBR essentially calls them "jam-o-matics' compared to a basic AR15. |
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It’s the normal version with standard handguard but no rear sight. Also has a standard buffer tube. It was $999.
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Originally Posted By fullmedaljacket8: It’s the normal version with standard handguard but no rear sight. Also has a standard buffer tube. It was $999. View Quote How exactly is the buffer to be attached? I sold mine a few years ago for $1800ish It was cool but I never shot it ,selling it paid for more ammo. |
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"Kid you're so lost, even I can't bring you home" - The North Star
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Adventure Outdoors in Atlanta GA still has two factory Sig 556 XI SBRs for like $1700-$1800.
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Originally Posted By PGT_0673: Seems every cop I've talked to who was issued a Sig556 SBR essentially calls them "jam-o-matics' compared to a basic AR15. View Quote View All Quotes View All Quotes Originally Posted By PGT_0673: Seems every cop I've talked to who was issued a Sig556 SBR essentially calls them "jam-o-matics' compared to a basic AR15. That's interesting. Mine is certainly overgassed (like all Sig 55X guns), but it's been 100% reliable. Originally Posted By cherenkov: Adventure Outdoors in Atlanta GA still has two factory Sig 556 XI SBRs for like $1700-$1800. Factory new or used? What are they chambered in? |
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Originally Posted By fullmedaljacket8: Not exactly sure how it was attached but it had a castle nut and an AR buffer tube. No brace attached. View Quote Originally Posted By kwb377: OP: $1k is a good current price...you could make at least $500 turning it around on GB. The early 556 rifles and all the P556's had a buffer tube lower receiver before they switched the rifles to the Swiss-style folding lowers. The pistols usually came with a cap that was unscrewed and replaced by a standard M4 receiver extension (or pistol tube)... {borrowed pic from the 'net} https://cdn2.armslist.com/sites/armslist/uploads/posts/2013/04/12/1444185_02_lnib_sig_sauer_p556_swat_640.jpg View Quote I've seen pics online of version that had a factory Swiss style folder with an AR buffer tube. Mine was like the pic KWB posted, I would think the factory folder version would be worth more. |
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"Kid you're so lost, even I can't bring you home" - The North Star
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I’ll give the shop a call in the morning and see if they still have it.
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@fullmedaljacket8
For $999 that's an easy Yes! Originally Posted By Bret: That's interesting. Mine is certainly overgassed (like all Sig 55X guns), but it's been 100% reliable. Factory new or used? What are they chambered in? View Quote View All Quotes View All Quotes Originally Posted By Bret: Originally Posted By PGT_0673: Seems every cop I've talked to who was issued a Sig556 SBR essentially calls them "jam-o-matics' compared to a basic AR15. That's interesting. Mine is certainly overgassed (like all Sig 55X guns), but it's been 100% reliable. Originally Posted By cherenkov: Adventure Outdoors in Atlanta GA still has two factory Sig 556 XI SBRs for like $1700-$1800. Factory new or used? What are they chambered in? @Bret In regards to those XI's... Why not jump on them? In a few years even if you don't keep those guns they will appreciate! I still have a 556R Gen2 that I love, and I had a 556SWAT FDE Gen1 that was amazing. They seem to be pretty tough guns especially after the small fixes and revisions. I've never had an XI, but they were said to be pretty nice guns if they ran well, definitely a more premium 556 variant IMO. |
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Precious Metal Delivery Service
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Would any rear sight work? Or would I have to find a sig one?
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Originally Posted By PGT_0673: It can either be Swiss style or M4 style but not both. There is a company selling a Swiss style stock that works on the M4 style lowers. AGP Arms...is that what you're referring to? https://i.imgur.com/uvZJcFCh.jpg View Quote Apparently it was an aftermarket adapter by ddles , not OEM Attached File |
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"Kid you're so lost, even I can't bring you home" - The North Star
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Oh yes, I have a few. Useful mainly for adding a brace. Makes no sense to convert Swiss to M4 when everybody wanted Swiss style lowers and M4 lowers are almost worthless
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I have a 556P that I sbr’d. Nothing jamomatic about it. Runs and runs.
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Interesting. Can you put a regular Swiss lower on one of these? I assume the upper is the serialized part?
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Picked it up today. No rear sight nestled in the rail. The buffer tube doesn’t seem to be mil spec. I tried a sba4 way too tight.
Attached File Attached File Attached File |
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Do you have three or four torx screws for the top rail? Believe it should be four without the popsicle sight.
Good news is that someone’s already removed the plug with a spanner. Should be easy to swap the tube now for whatever you want. Also, that handguard is nice to have unless you really prefer a quad rail (if so, msg me) |
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It has three torx screws.
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Originally Posted By Bret: That's interesting. Mine is certainly overgassed (like all Sig 55X guns), but it's been 100% reliable. Factory new or used? What are they chambered in? View Quote Look Factory New- they are a big Sig Dealer. One in 5.56 and one in 7.62x39. Its at their NFA counter section where they sell suppressors. |
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Before the prices went crazy I passed on one for around $650 and I’m a 55x person. 1k is still probably a good price but I see their value from mainly a collectibility standpoint as they use a funky length system that’s not Swiss based or common with parts. People also say they suck suppressed, so I don’t get the appeal.
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Originally Posted By PGT_0673: interesting. Positive is that you can keep an eye out for one with the rear sight. If it was four screws, there wouldn’t be that option View Quote Glad to hear that just took the tube off. Buffer was in backwards and behind the spring at the end of the tube for some reason… Attached File |
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Originally Posted By JohnnyLoco: Before the prices went crazy I passed on one for around $650 and I’m a 55x person. 1k is still probably a good price but I see their value from mainly a collectibility standpoint as they use a funky length system that’s not Swiss based or common with parts. People also say they suck suppressed, so I don’t get the appeal. View Quote I got it because I sold my scar 16s, plus it’s not an AR. Also that it’s a pistol. |
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Originally Posted By fullmedaljacket8: Glad to hear that just took the tube off. Buffer was in backwards and behind the spring at the end of the tube for some reason… https://www.ar15.com/media/mediaFiles/46983/IMG_3940_jpeg-3121735.JPG View Quote Free parts. The P556 needs no AR15 spring or buffer. Look at the inside of the lower…literally no way they do anything |
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Originally Posted By fullmedaljacket8: Oh I know it doesn’t need them just found it hilarious and frightening that someone did that. View Quote Looks like they destroyed the takedown detent spring for you also. The detent is different than an AR, but the spring is the same (at least on mine). As far as sights...that hooded front sight is a U.S. Sig556-specific height. You'll have to either find a replacement popsicle rear that folds into the top rail (and to make matters more confusing, there's at least two different height popsicle rear sights depending on what front sight the rifle/pistol came with), or find one of the Sig U.S. spec rear diopters. Or you can go full MFI set up and install their rail/diopter and front sight combo. |
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Originally Posted By kwb377: Looks like they destroyed the takedown detent spring for you also. The detent is different than an AR, but the spring is the same (at least on mine). As far as sights...that hooded front sight is a U.S. Sig556-specific height. You'll have to either find a replacement popsicle rear that folds into the top rail (and to make matters more confusing, there's at least two different height popsicle rear sights depending on what front sight the rifle/pistol came with), or find one of the Sig U.S. spec rear diopters. Or you can go full MFI set up and install their rail/diopter and front sight combo. View Quote Any idea on where to get the detent? I’ll probably end up one day getting the Samson replacement sights. |
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Awesome thank you. I emailed sig lol let’s see what they say.
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your detent looks to be jammed inside the spring. extract that and us an AR detent spring
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Originally Posted By GLD1980: @fullmedaljacket8 For $999 that's an easy Yes! @Bret In regards to those XI's... Why not jump on them? In a few years even if you don't keep those guns they will appreciate! I still have a 556R Gen2 that I love, and I had a 556SWAT FDE Gen1 that was amazing. They seem to be pretty tough guns especially after the small fixes and revisions. I've never had an XI, but they were said to be pretty nice guns if they ran well, definitely a more premium 556 variant IMO. View Quote Frankly I am not a fan of the XI guns, I just never got into them. I love the 55X series, in general but not that one - I also have the Rattler and Virtus so lots of interests. I don't go to that store often enough, and although I saw the guns, I said huh, they still have these! I also seem to have a wandering eye and have many different gun interests, and would rather save the money for something else. I have a lot I saw at SHot this year I want to buy before retirement. |
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OP: Another worthwhile (and frustration reducing) item...
https://knsprecisioninc.com/sig-556-push-button-pivot-pin/ Replaces the screw type front pivot pin. |
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I bought one of those pistols used last year, overpaid slightly but whatever. Really only for donor parts.
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The only way a bunch of cops think a 556 SBR is a jamomatic is because some Agency’s armorer thought he was smart and did something stupid. The fact is, there was a period of time where these were widely considered the most reliable 5.56 SBRs, because short ARs were still very hit and miss. The market has def caught up there.
I have a pair and they are sewing machines. You can get replacement gas plugs to adjust the gas. From the factory, they do eject quite vigorously, lol. The biggest problem suppressing them is that most QD muzzle device mounts block you from removing the gas plug and cleaning the gas system, not that you really need to do that very often on these puppies. Overgassing these isn’t an issue when suppressing them like it is on an AR, because for right handed shooters, there aren’t holes for gas to escape into your face. Get your Form 4 in and go have fun. If you scored it for $1k, you got a good deal. |
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I had one it was I POS jamomatic. I remembered reading someplace that some of them had soft extractor pins that caused the extractor to bind. I put in a 55x bolt group and it ran fine, except for 12 inch “ groups” at 100 yards. And that’s why I will never buy a Sig USA product again.
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Originally Posted By jtb33: What's funny is that at one time, I was after those US-made 556 short (non-railed) handguards and could not find someone willing to sell a pair, that I bought an entire patrol rifle just to get those handguards. (afterwards, I threw on a set of Samson railed handguards and sold the gun off for what I paid for it, all to get the handguards) View Quote I did the same thing to get those handguards for my P556 (originally came with cut-down fishgille handguards), except it was a P522. Swapped the handguards and sold the P522 for $75 more than I bought it for. I also bought a 556 Patrol just to get the folding stock lower for my early buffertube-lower 556 rifle. Swapped lowers and sold the Patrol for $200 more than I paid. |
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I bought a P522 SWAT just to steal the lug off the quad rail to replace one missing on my white camo rifle. Sold it for more than I paid but sourced an impossible to find part.
When 556 variants were super cheap on the used market (three digit prices), I bought more than a few to harvest parts. Sights, stocks, handguards, lowers, etc. I combined stuff I didn't want and sold off whole rifles or parted stuff out. That's what happens when the parts are worth more than the whole. |
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Glad this thread is getting some traction. Anyway after checking out my pistol more I noticed the gas block is canted quite a bit. I ended taking the front sight off and putting a MRO on the pic rail. Picked up something on the EE to replace the odd ball buffer tube. I took the gun apart, it was pretty dirty I don’t think it’s ever been cleaned. I’m gonna take it to the range tomorrow, crossing my fingers that it runs well.
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Originally Posted By Shackelford762: The only way a bunch of cops think a 556 SBR is a jamomatic is because some Agency’s armorer thought he was smart and did something stupid. The fact is, there was a period of time where these were widely considered the most reliable 5.56 SBRs, because short ARs were still very hit and miss. The market has def caught up there. I have a pair and they are sewing machines. You can get replacement gas plugs to adjust the gas. From the factory, they do eject quite vigorously, lol. The biggest problem suppressing them is that most QD muzzle device mounts block you from removing the gas plug and cleaning the gas system, not that you really need to do that very often on these puppies. Overgassing these isn’t an issue when suppressing them like it is on an AR, because for right handed shooters, there aren’t holes for gas to escape into your face. Get your Form 4 in and go have fun. If you scored it for $1k, you got a good deal. View Quote Agree 100%. I’ve owned a bunch of Sig 556 variants and they were all extremely reliable except a rifle with a 2009 build date that had an out of spec upper. The other dozen were extremely robust. The xi generation was especially functional since you could swap the charging handle to either side. |
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Ran three mags through it today. Such a fun gun, glad you dudes talked me into it. Ran 100% & very accurate.
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Originally Posted By jtb33: I've got a few iterations of SIG 556's in my collection. The 556XI is probably the best of the 556's... it's got the gas setting specifically for a suppressor and you can put the charging handle on the opposite side. The foregrip options suck though, and the keymod one (it was pre MLOK) is really the only useful one if you want to attach anything and they are like hen's teeth. The 556XI lowers are better than any of the earlier 556 lowers. What's funny is that at one time, I was after those US-made 556 short (non-railed) handguards and could not find someone willing to sell a pair, that I bought an entire patrol rifle just to get those handguards. (afterwards, I threw on a set of Samson railed handguards and sold the gun off for what I paid for it, all to get the handguards) BTW, if you were looking for some sights, I did list a set of Samson push-button flip ups a couple days ago in the EE that are basically new. Here are some of my SIG 556's: https://live.staticflickr.com/65535/52019184949_4d0c78dcf0_k.jpg https://live.staticflickr.com/65535/52432121711_794147ad55_k.jpg https://live.staticflickr.com/65535/52394635228_22c642670f_k.jpg https://live.staticflickr.com/65535/52070907079_1ad91c507c_k.jpg https://live.staticflickr.com/65535/51971425567_ec9414b9a1_k.jpg View Quote How did you get the lancer mags to work? What's an option for 55X magazines these days? Factory 30 rounders are $150 if you can find them. |
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Originally Posted By scrolledandtabbed: How did you get the lancer mags to work? What's an option for 55X magazines these days? Factory 30 rounders are $150 if you can find them. View Quote https://www.ar15.com/forums/armory/Interesting--50-device-to-allow-SIG-550-1-2-3-556-rifles-to-use-STANAG-mags/45-534508/ |
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“The difference between treason and patriotism is only a matter of dates.”
"And how can man die better Than facing fearful odds, For the ashes of his fathers, And the temples of his Gods." |
Originally Posted By jtb33: Didn't have to do anything in a SIG 556 lower... but if you have a SIG 550 lower, that's another story. I did try this a while ago: https://www.ar15.com/forums/armory/Interesting--50-device-to-allow-SIG-550-1-2-3-556-rifles-to-use-STANAG-mags/45-534508/ View Quote that guy is a major hack. he "builds" rifles and other stuff but none of it is well done. |
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Originally Posted By PGT_0673: that guy is a major hack. he "builds" rifles and other stuff but none of it is well done. View Quote |
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“The difference between treason and patriotism is only a matter of dates.”
"And how can man die better Than facing fearful odds, For the ashes of his fathers, And the temples of his Gods." |
Originally Posted By jtb33: Don't know the guy or the company - just happened to find those adapters on Gunbroker. I can see that his SIG looks quite... interesting... in the videos. The adapters I got kinda work, sometimes. I don't use them - I just went ahead and purchased a half-dozen Swiss mags for my Swiss lowers. View Quote Interfor in Texas. I bought a Beretta AR70/90 kit build from him. It was a hot mess...fingerprints in the paint (wtf lol), improperly demilled rear sight (didn't cut old receiver off before tacking to new one), rear takedown welded improperly so needed a hammer and punch to open it up (kinda important if you need to clear a live round for whatever reason) and could never get it sighted on paper even at 20yds (see aforementioned note about rear sight) and was a royal arse when I asked him to fix it. Telling me he was a soldier in Italy was his reason for knowing how to build these correctly, as if a grunt knows how to weld and render a full auto lower semi properly. He's a joke. |
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