SIGforum
WTS: SIG 556-to-551 barrel, Swiss 55X magazines, SE Vortex Ops Inc hider, C7/A1E2 upper, 552/3 HG

This topic can be found at:
https://sigforum.com/eve/forums/a/tpc/f/350601935/m/1960056494

September 07, 2022, 11:59 AM
KSGM
WTS: SIG 556-to-551 barrel, Swiss 55X magazines, SE Vortex Ops Inc hider, C7/A1E2 upper, 552/3 HG
556-to-551 conversion barrel. Swiss 551 barrel with trunnion thread adapter to enable installation in a US 556 receiver. Will need completed by a gunsmith. Barrel comes with two-piece barrel extension as well, which enables a 16" length without any modification to the barrel itself. $350 shipped.

Used, "restricted" LE-marked, 20rd Swiss 55X mags. Three available. $95 shipped per mag, or $265 shipped for all three. All magazines will be inspected at known failure points before shipping.

Used, good condition. C7/A1E2 "A2 with field sights" upper. I've seen this configuration called a few things; I am not sure what is technically correct. It is not an actual Diemaco; it is marked with a D and a K. No M4 feed ramps. Fixed carry handle with A1 sight, forward assist, and brass deflector. $100 shipped.

Used Smith Enterprise Vortex flash hider 1/2x28 with external threads for Ops Inc Model 12 (AEM5/OCM5). $60 shipped.

Sig 552/553 Swiss SAN black plastic handguard. Used; like-new. $100 shipped.

Sig 55X upswept Swiss cocking handle. Used. Good condition. $75 shipped.

US Sig 556 "Patrol" recoil assembly. Brand new in the package PN: 1511879-R. This is the good, unfluted rod with flat wire spring. $150 shipped.

B&T Rotex flash hider for Sig 552/3. 14x1LH thread. $75 shipped.

Reproduction Sig 552 recoil springs. $40 each; shipped.

I also have some other unique and/or hard to find Sig 55X rifle parts. Let me know if there's something specific you're after.

Email for pictures or questions. Payment methods accepted are CC+4%, PPf+f, personal check, or USPS MO. Will not ship until a week after deposit of personal check. Additional shipping fees incurred for AK, HI, WA, CA, and OR.

Willing to cut a deal, for anyone buying multiple things.

This message has been edited. Last edited by: KSGM,
September 09, 2022, 11:13 AM
KSGM
I have produced a small run of Sig SG551 silencer adapters. The adapters use a Halo-style collar and pocket attachment interface, and are compatible with silencers threaded in 1.375x24, otherwise known as “HUB”. The adapters are CNC machined from 17-4 stainless steel, and salt bath nitrided.

In the interest of transparency, I want to make potential purchasers aware of an idiosyncrasy:

The HUB threads on the adapters are on the small side; this means there is a bit of wiggle when you are screwing the adapter into the silencer; the play obviously disappears when the unit is completely tightened. This phenomenon is consistent across all units and all silencers I have threaded the adapters into, to varying degrees, depending on the silencer manufacturer's thread tolerances.

Q&A:

Q: Will the adapter work on a 550 or 551/3 LB?

A: No. Those weapons use one of two possible flash hiders of NATO dimensions. Depending on which flash hider your rifle has, there may already be silencer options available.

Q: Can you produce an adapter that will work on a 550 or 551/3 LB?

A: Yes. The same design can be modified slightly, and applied to a 550 silencer adapter. However, I don't intend to invest in a run of 550 adapters in the near future.

Q: Will this adapter work with my (insert make/model of silencer)?

A: Only if it is threaded 1.375x24 in the back. If the silencer manufacturer states their silencer is threaded “HUB”, 1.375x24, or 1 3/8 x 24, it will work.

Q: Will this adapter work on the 551 with the longer barrel without the grenade gasket?

A: No. This adapter is for a proper 551 only. Dimensions of the flash hider should be as follows:
Diameter of flash hider not to exceed .845"
Length of flash hider ~1.650"
Length of flash hider including taper down to barrel diameter ~1.950"
Barrel diameter behind flash hider not to exceed .570"


$140.00 shipped. Email for pictures or questions. Payment methods accepted are CC+4%, PPf+f, personal check, or USPS MO. Will not ship until a week after deposit of personal check. Additional shipping fees incurred for AK, HI, WA, CA, and OR.

This message has been edited. Last edited by: KSGM,
September 16, 2022, 09:43 PM
redrider1596
Email sent regarding H2.
September 17, 2022, 05:28 AM
KSGM
Replied to redrider1596
September 23, 2022, 02:03 PM
KSGM
H2 Micro now includes Larue mount.
October 02, 2022, 04:29 PM
KSGM
Price adjusted on barrel.
October 20, 2022, 06:15 PM
Slippery Pete
I'll take the H2.


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http://defendersoffreedom.us/
October 20, 2022, 06:18 PM
KSGM
H2 sold to SP. It was a pleasure.
October 24, 2022, 04:25 PM
Slippery Pete
H2 received and looks great. Shipped it FAST!

Appreciate it.


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http://defendersoffreedom.us/
November 04, 2022, 09:51 AM
KSGM
Items and prices changed.
November 15, 2022, 08:57 AM
KSGM
Items added.
November 16, 2022, 10:07 PM
Frenchy1004
I'll take the carry handle for $65 shipped, email inbound.
November 17, 2022, 05:45 AM
KSGM
Replied
November 17, 2022, 10:19 AM
KSGM
Carry handle sold to Frenchy. Thanks for a smooth transaction.
November 22, 2022, 02:19 PM
Frenchy1004
Carry handle arrived yesterday without issue, looks fantastic. Thanks for the great sale.
December 12, 2022, 06:08 AM
KSGM
Items added.
December 15, 2022, 06:17 AM
KSGM
Swiss mags added, and prices adjusted.
December 31, 2022, 12:55 PM
KSGM
All still available.

I also have other some unique and/or hard to find Sig 55X rifle parts. Let me know if there's something specific you're after.
January 01, 2023, 12:42 PM
Dzozer
I'll take both of these-
"New Swiss Sig 55x 20rd 5.56 magazines. Two available"
Email inbound... Thanks!



'Live long and prosper'
January 01, 2023, 12:46 PM
KSGM
Mags Sold to Dzozer