[Parts] SIG 542 ( .308 / 7.62 NATO ) Parts Kit with Intact Barrel & Bayonet - Folding Stock Drop #2 - $1,199.99 + $12.99 S&H
Posted by CenterfireSystems@reddit | gundeals | View on Reddit | 71 comments
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808Code@reddit
Were these kits not 400$ 2 months ago?
Expensive-School-782@reddit
No never
allamerican37@reddit
They were 1199 for the folding stock and I believe 1099 for the fixed, SIG 543.
mattbick2003@reddit
Receivers are also being made for these by a single company at the moment. Here is the link: https://ttepmw.com/gear/sg-543-receiver-kits/
I myself will be post sampling one.
Best wishes,
Matt, Bickham Firearms
nullified_lex@reddit
Is there a recommended gunsmith who could do final assembly if we have the parts kit and receiver?
mattbick2003@reddit
Oh man that is a hard one to answer since rebuilding these isnt that widely done in the US. I would say this is a build you could do yourself once you get the 100% receiver.
FadingFX@reddit
Theoretically the fact it’s a 100% reciever should massively help
RoyalSteele@reddit
From ChatGPT: Alright—here’s a real builder-level SIG 542 parts list, broken down the way guys actually approach these kits. This isn’t a generic diagram—this is the practical “what you need vs what you’ll have to source/fabricate” list.
⸻
🔧 SIG SG 542 FULL BUILD PARTS LIST
🧱 1. RECEIVER GROUP (hardest part)
👉 You already know this is the bottleneck
Required: • Upper receiver shell (stamped) • Lower receiver (trigger housing) • Internal guide rails (must be welded) • Front trunnion / barrel mounting interface • Rear stock interface block
Notes: • The receiver houses all major internal components including feed + trigger systems  • Expect: • welding rails • trunnion alignment • fitting bolt carrier
⸻
🔩 2. BARREL + FRONT END
(Usually included in good kits) • Barrel (7.62×51 NATO, ~465mm)  • Barrel extension / trunnion interface • Flash hider / muzzle device • Front sight assembly (hooded post) • Gas block (integrated with front system)
⸻
⚙️ 3. GAS SYSTEM (critical for function)
SIG 54x rifles use a long-stroke piston system 
Parts: • Gas piston • Gas tube / cylinder • Adjustable gas regulator (3-position) • Piston return spring (wrapped around rod)
⸻
🔄 4. BOLT CARRIER GROUP
(Usually included, but inspect carefully) • Bolt carrier • Rotating bolt • Firing pin • Cam pin / locking interface • Extractor + spring • Ejector (receiver-mounted)
⸻
🎯 5. TRIGGER / LOWER COMPONENTS
(All inside lower receiver) • Trigger • Hammer • Disconnector • Safety / selector lever • Springs + pins • Grip screw + mounting hardware
⚠️ Important: • Most kits are select-fire origin • Must be converted to semi-auto compliant configuration
⸻
🧲 6. RECOIL SYSTEM
Unique SIG setup: • Recoil spring (wrapped around piston rod) • Guide rod assembly • Rear spring interface block
⸻
🪵 7. FURNITURE
(Usually comes with kit—but varies) • Stock (fixed or folding) • Handguard (polymer, often loose fit) • Pistol grip
⸻
🔭 8. SIGHTS / OPTICS • Rear diopter drum (100–600m settings)  • Front sight post (hooded) • Optional optic mount (rare)
⸻
🧾 9. MAGAZINE SYSTEM • 20- or 30-round magazines  • Magazine catch + spring • Feed ramp (integrated in receiver)
⸻
🔩 10. SMALL PARTS / HARDWARE (people underestimate this) • All pins (trigger, bolt catch, etc.) • Springs (various—easy to lose) • Retaining clips • Charging handle • Bolt hold-open components
⸻
🧰 11. WHAT MOST KITS INCLUDE (REALITY CHECK)
From current imports (Lebanese / surplus kits):
You typically get: • Complete front end (barrel + gas system) • Bolt carrier group • Lower + trigger pack (full-auto origin) • Stock + furniture • Small parts (mostly)
👉 Often even include: • bayonet • original barrel (huge advantage vs older kits)
⸻
❗ 12. WHAT YOU STILL NEED TO SOURCE
This is where builds stall:
MUST SOURCE • Receiver (upper + rails) • Semi-auto compliance parts/mods • Possibly: • new springs • replacement pins • compliance trigger work
MAY NEED • Headspace adjustment • Barrel reinstallation / alignment
DIFFICULTY: SIG 542 Hard+ / niche
Why: • Stamped receiver + welded rails • Limited jigs/tools available • Almost no “step-by-step” ecosystem
⸻
🧠 PRO TIPS (from current builders)
From recent builder discussions:
“If you get a complete receiver, assembly isn’t too bad… but can you weld?” 
“Original barrels + trunnions make builds easier now” 
👉 Translation: • With a finished receiver → doable • Without one → project stalls fast
⸻
💡 SMART BUILD STRATEGY
If I were doing this today:
Option A (most realistic) 1. Buy complete parts kit (with barrel) 2. Wait for receiver drop (TTE or similar) 3. Send to builder OR weld yourself
Option B (advanced) • Custom receiver + full build • Expect $3K–$5K all-in
⸻
🧭 Bottom line
A SIG 542 build is: • Parts kit = easy to find • Receiver = choke point • Assembly = HK-level difficulty
But if done right: 👉 You end up with a rare, Cold War-era battle rifle almost nobody else has
Crafty-Strategy-7959@reddit
Fucking AI slop
velillen@reddit
For those wondering...it's a fairly easy build. It's been documented over on weaponsguild.
Get the receiver from TTE and you'll need to weld in the rails and lugs and things. Pretty easy just go slow and measure/test fit things. Even the FCG conversion is simple.
Receiver alone is like $400. If your hangldgiard or grip are chipped/damaged you can get those too. I think a full "kit" from TTE (receiver, handguard, grip, and more) was like $800.
If you need it built by a gun smith....shouldn't be hard for any who have built guns before. Align and weld rails, align lugs, install bolt hold open. Do the FCG mods. Done
APC9Proer@reddit
Worth doing this?
dad-jokes-about-you@reddit
Worth buying and putting in a closet for relatives to find in 40 years.
RoyalSteele@reddit
How hard is the build? Worth it?
dad-jokes-about-you@reddit
Buy it and save it for when you have 13 permanent heart containers
Ok_Gap708@reddit
Same, what I'm gathering from the comments, if I get the receiver (complete) then putting it together ain't too bad
Desertman123@reddit
can you weld?
Ok_Gap708@reddit
Depends on the type of welding but generally speaking yes.
Desertman123@reddit
youll be fine
J4R131@reddit
Also would like to know…
demarco32@reddit
Careful they dont guarantee matching. Apex does for close to the same price
Ok_Gap708@reddit
Apex is $800 more and fixed stock
demarco32@reddit
https://www.apexgunparts.com/sig-542-parts-kit-w-original-18-barrel-side-folding-stock-matching-bolt-carrier-lower-7-62x51mm-nato-gd-bndl.html
Ok_Gap708@reddit
I see the problem here, I need to register to see the price and all that.
RoyalSteele@reddit
Receivers “coming soon” https://ttepmw.com/vault/gun-parts-kits/sg-543-542/ Found this, no affiliation.
CommunalJellyRoll@reddit
Some times you gotta put on a dress and work the corner for extra cash. This is one of those times.
my_sock_account@reddit
This is my grail gun. Wish I had the cash right now.
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