QUADRADYN ARMS // TECHNICAL DOCKET [PUBLIC]
> VERIFYING MODEL MANIFEST ........ SARC-6
> LOADING BALLISTIC REFERENCE ..... 6 ARC
> MAGAZINE INTERFACE .............. PMAG 25 ICAR
> PRODUCT CONSOLE ONLINE. T-0

SARC-6 6mm ARC

6mm ARC // 12.5-inch carbine // ICAR-magazine compatible receiver set

The reach of a precision cartridge, engineered into a compact platform built around the magazine the cartridge always needed. The SARC-6 is the first ICAR-magazine compatible 6mm ARC rifle offered to the public - built on a Quadradyn-modified ICAR receiver set, gauged end to end, and configured for hard use by law enforcement, military professionals, and the demanding civilian defender.

$1,650 In stock // ships in 5-6 days Ships to your FFL Magpul PMAG 25 ICAR

Precision stainless barrel with a clamp-on adjustable gas block. The most precise SARC-6.

$1,650 In stock // ships in 5-6 days
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SARC-6 product visualization

MODEL // SARC-6
Still frame from the SARC-6 video: a shooter firing the Quadradyn SARC-6 6mm ARC carbine on an outdoor range

Two Builds. One Rifle.

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Every SARC-6 shares the same receiver set, 12.5-inch 6mm ARC architecture, reinforced bolt, buffer system and release inspection. Your configuration decides which barrel steel you get and how the gas block is attached, along with the trigger (an ALG ACT on the SARC-6, an ALG QMS on the SARC-6 Tactical), stock, handguard and finish. Barrel steel and gas-block attachment pull the accuracy-versus-durability trade in opposite directions, so read the cards before you pick.

CFG.01 // SARC-6SARC6-SS

SARC-6 (with stainless steel barrel)

$1,650Ships to your FFL

The precision selection. A stainless 12.5-inch barrel paired with a clamp-on adjustable gas block so nothing bears on the barrel except the clamp itself. Choose it when group size matters more than round count.

  • Stainless steel barrel - more precise, less durable than CMV
  • Clamp-on adjustable gas block for maximum accuracy
  • Reinforced bolt with thicker bolt-face rim for high pressure loads and extended life
  • ALG ACT trigger
In stock // ships in 5-6 days
CFG.02 // TACTICALSARC6-CMV

SARC-6 Tactical (with CMV steel barrel)

$1,949Ships to your FFL

The hard-use selection. A chrome-moly vanadium 12.5-inch barrel, a dual set-screw and chemically pinned adjustable gas block locked against movement, and a Duraveil Cerakote finish.

  • CMV steel barrel - more durable, less precise than stainless
  • Dual set-screw and chemically pinned adjustable gas block for less movement under hard use
  • Reinforced bolt with thicker bolt-face rim for high pressure loads and extended life
  • ALG QMS trigger
  • Duraveil Cerakote finish standard - infrared-invisible outside, ultra-slick inside
In stock // ships in 2-3 weeks

Spec Readout

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SARC-6.SPEC_READOUT // SARC-6 (with stainless steel barrel)

Marked values change with the model selected above. Final specifications follow the production configuration.

Purchase

PURCHASE.TERMINAL // SARC-6SARC6-SS
$1,650
SARC-6 (with stainless steel barrel)
Precision stainless barrel with a clamp-on adjustable gas block. The most precise SARC-6.In stock // ships in 5-6 days
SARC-6 (with stainless steel barrel)
$1,650
Thread protector
Free
Total
$1,650
6 ARC barrel
> SHIPS TO YOUR FFL // TRANSFER PAPERWORK AND REQUIRED CHECKS COMPLETED AT PICKUP // IN STOCK // SHIPS IN 5-6 DAYS

Gas Block & Bolt

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Stainless // Clamp-On Gas

Built for accuracy

The stainless SARC-6 uses a clamp-on adjustable gas block. A clamp-on block grips the gas journal evenly around its full circumference instead of driving set screws into the barrel. Nothing dents, dimples, or point-loads the steel under the block, so the barrel keeps the concentric, stress-free profile it left the machine with. That is the point of choosing stainless in the first place: a barrel selected for machining consistency deserves a gas block that does not disturb it.

The adjustable port lets the shooter meter gas for suppressed or unsuppressed use, ammunition lot, and temperature, which keeps carrier speed civil and protects brass, extractor, and the bolt itself. Stainless is the less durable of the two barrel steels under sustained heat, but for a shooter who values repeatability shot to shot, it is the more precise choice.

Bolt

The stainless configuration ships with Quadradyn's reinforced bolt, cut with a thicker bolt-face rim for high pressure loads and extended life and paired with the full-profile carrier and H2 recoil system. Every stainless rifle is gauged for headspace, bolt-to-carrier relationship, and gas-system fit before release.

CMV // Dual Set-Screw & Chemically Pinned Gas

Built for round count

The SARC-6 Tactical uses a dual set-screw and chemically pinned adjustable gas block seated into the barrel. Set screws bear directly on the journal, which is exactly why we specify them here: a set-screw block resists rotation and creep under heat, impact, and high round counts better than a clamp does. Combined with a chrome-moly vanadium barrel that shrugs off throat erosion and sustained fire far longer than stainless, the result is a rifle that trades a measure of raw precision for durability.

The block remains adjustable, so the same suppressor tuning applies. What changes is how the block holds the barrel: less movement, more margin, a rifle you can run hot without checking screws every session.

Bolt

The CMV configuration carries the same reinforced bolt. The 6mm ARC case head is wider than 5.56, which thins the rim of a conventional AR-15 bolt face and is the historical weak point of small-frame 6 ARC rifles. The thicker bolt-face rim restores that margin for high pressure loads and extended life. If your SARC-6 will see mag dumps, drills, and duty use, the CMV barrel and locked gas block make this the configuration.

Design Doctrine

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DOCTRINE 01 // CARTRIDGE
01 / SPECIAL-MISSION DNA

6 ARC - Selected for the Mission.

Hornady introduced 6mm ARC in 2020 after a specialized U.S. Department of Defense group selected and fielded it for a multipurpose combat-rifle program. The brief was consequential: move efficient 6mm projectiles through an AR-15-size system and extend practical reach without the recoil and carry burden of .308.

Documented: specialized DoD selection // no endorsement implied
DOCTRINE 02 // RECEIVER
02 / ICAR-MAGAZINE COMPATIBLE

The Right Magazine, Finally.

SARC-6 is built on the Sabre-IC receiver set from Palmetto State Armory, an ICAR-pattern set with the wider magwell that the Magpul PMAG 25 ICAR was designed for. Quadradyn modifies that receiver set before assembly, and the receivers are a small part of the complete firearm: barrel, gas system, bolt, carrier, recoil system, and inspection are ours.

Runs Magpul PMAG 25 ICAR // does not accept STANAG AR-15 magazines
DOCTRINE 03 // RELEASE
03 / MEASURED, NOT ASSUMED

Gauged. Not Assumed.

Every SARC-6 is dimensionally evaluated end to end using a measurement-first inspection plan informed by School of the American Rifle practices. Headspace, bolt and carrier relationships, gas-system interfaces, feed geometry, and control function must meet the written Quadradyn acceptance standard before release.

100% gauge-based release inspection // not third-party certification

Stock or Pistol Brace?

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01 // SBR STATES

States That Receive Stocks

The states we have determined do not have a state law requiring SBRs to be federally registered, which we automatically ship a stock to, are: Arkansas, Idaho, Indiana, Kansas, Kentucky, Maine, Minnesota, Mississippi, New Hampshire, New Mexico, South Dakota, Tennessee, Texas, Utah, Vermont, West Virginia, and Wyoming.

02 // PISTOL STATES

States That Receive Pistol Braces

The states that have a law stating that SBRs must be registered federally or are illegal, where we automatically ship a pistol brace: Alabama, Alaska, Arizona, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Illinois, Iowa, Louisiana, Maryland, Massachusetts, Michigan, Missouri, Montana, Nebraska, Nevada, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, Virginia, Washington, Wisconsin, and the District of Columbia.

(SARC-6 never ships to CA, CT, DE, DC, HI, IL, MD, MA, NJ, NY, RI, VA, or WA)

03 // HARDWARE

Stock and Brace by Build

The SARC-6 ships with a B5 stock. The SARC-6 Tactical ships with a Magpul DT-PR collapsible stock with a removable cheek riser. Where a pistol brace is required, either build ships with an SB Tactical SBA4 brace in place of the stock.

04 // REQUESTS

Questions and State Changes

Reach out to us on our contact form if you have any requests related to this issue, or if you believe your state has changed its law since the October 9 ATF guidance.

SARC-6 shipping, warranty and support

Dealer Shipping

Serialized firearms ship only to a valid Federal Firearms Licensee. Your receiving dealer completes the transfer and all required checks.

Buyer selects receiving FFL

Double Lifetime

Limited lifetime coverage follows the original retail purchaser and one registered subsequent lawful owner. Barrel, springs, and other consumable or normal-wear parts are excluded.

Two-owner coverage

Direct Support

Configuration questions, transfer coordination, documentation, and post-purchase technical support connect directly to Quadradyn.

Manufacturer-level continuity

Development Group

Every firearm purchase includes complimentary lifetime membership for the original purchaser, with member research, news, and select training opportunities.

Lifetime membership included

Compliance & specification notice. Final specifications, classification, availability, and included equipment are subject to the production configuration and applicable law. Buyer is responsible for confirming legality with the receiving dealer. Any suppressor, regulated accessory, or NFA configuration is separate and subject to additional federal, state, and local requirements. DoD references describe the cartridge’s published development history; no government or unit endorsement of Quadradyn is stated or implied. ICAR is a trademark of SureFire, LLC; PMAG is a trademark of Magpul Industries; Sabre is a trademark of Palmetto State Armory. Quadradyn is not affiliated with any of them.