Complete 551 Estes Adams conversion upper receiver. On a nice 556 upper, with the clean swirly spot welds. Full diopter conversion with all Swiss guts. Two bummers: handguard has an extra hole drilled in one side (I don't have another 551 handguard) and the finish is worn on the scope mount "crest". The front filler weld is also not perfect, but that was a chance you took on these conversions, I guess. Includes a four-notch gas valve, for you to port how you wish, and a 1.375x24 "HUB" silencer adapter. Upper will transfer on a form4. $1,100 (plus insured shipping to your FFL and the $200 to the fed. Shipping will be paid when form4 is complete.)

Used, like-new in box. Trijicon TA01NSN ACOG. This is the tritium-only model, with BUIS on top. $800 shipped.

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. $125 shipped.

Sig 552/553 Swiss SAN black plastic handguard. Used; like-new. $130 shipped.

Sig 550 Swiss black plastic handguard. Can also be used to make a 552/3 clone handguard for a US "patrol" gas system, with a handguard cap (no, I don't have a cap). New. $130 shipped.

Sig 55X upswept Swiss cocking handle. Used. Good condition. $90 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. $200 shipped.

B&T Rotex flash hider for Sig 552/3. 14x1LH thread. $90 shipped.

Reproduction Sig 552 recoil springs. $50 each; shipped.

Larue fixed rear sight. Lightly used. $40 shipped.

Surefire helmet light. New. White/red with IR beacon. No packaging. $40 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,

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.

$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,

Email sent regarding H2.

Replied to redrider1596

H2 Micro now includes Larue mount.

Price adjusted on barrel.

I'll take the H2.

H2 sold to SP. It was a pleasure.

H2 received and looks great. Shipped it FAST!

Appreciate it.

Items and prices changed.

Items added.

I'll take the carry handle for $65 shipped, email inbound.

Replied

Carry handle sold to Frenchy. Thanks for a smooth transaction.

Carry handle arrived yesterday without issue, looks fantastic. Thanks for the great sale.

Items added.

Swiss mags added, and prices adjusted.

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.

I'll take both of these-
"New Swiss Sig 55x 20rd 5.56 magazines. Two available"
Email inbound... Thanks!

Mags Sold to Dzozer