16″ SOT WARTHOG .350 LEGEND
On the Sharps Bros WARTHOG billet lower
WARTHOG Series · Model SOT WARTHOG 350 · Two calibers, one rifle
Two calibers on one rifle. This is the straight-wall half.
- Chambering
- .350 Legend
- Barrel
- 16″ BA Hanson, QPQ
- Gas
- Carbine length, pinned
- Trigger
- MBT-2S, 4.5 lb
- Price
- $2,600.00
// The Operator’s Case
Everything behind the magazine well is the same rifle. The cartridge is the only thing you choose.
This rifle and the 6.5 Grendel WARTHOG are built to one specification from the magazine well back. Same SOTM4 billet upper, same 15″ SOT Wedge-Lock rail, same Breek Arms Mod 2 charging handle, same Sharps Bros WARTHOG billet lower, same LaRue MBT-2S at the same pull weights, same Radian Talon ambidextrous selector, same Geissele Maritime bolt catch, same Reptilia RECC·E™ stock and CQG™ grip, same Black Bush Hog Camo Cerakote®. Seventeen specification lines, identical.
What the cartridge changes is the barrel, the gas length, the muzzle device, the bolt and the magazines — and every one of those follows from the chambering rather than being a separate decision put in front of you. So the question a buyer answers is which cartridge, and nothing else. On this rifle the answer is .350 Legend: a straight-walled cartridge on a 16″ Ballistic Advantage Hanson barrel in 4150 CrMoV, QPQ finished, carbine gas, pinned block.
// Why The Straight Wall Is Easy Here
The .350 Legend shares the .223 rim, so the bolt does not change.
The .350 Legend carries the same .378″ nominal rim diameter as the .223 Remington, which means it headspaces on an unmodified 5.56 bolt face. That is unusual and it is worth understanding, because it is the opposite of what happens on the 6.5 Grendel WARTHOG, where the larger 7.62×39-pattern case head forces a different bolt.
So on this rifle the bolt carrier group is a standard 5.56 group and that is correct rather than a compromise: a Toolcraft DLC group running a Carpenter No. 158 bolt in an 8620 carrier, shot peened and magnetic particle inspected. C158 is the steel specified for the military bolt, and it is the option fitted here rather than 9310 — a choice, not a default. The DLC coating is among the hardest used in the industry, low friction and self-lubricating.
The magazine is the cartridge-specific part, not the bolt. Three DuraMag stainless .350 Legend magazines ship with the rifle, and they are not interchangeable with 5.56 magazines even though a 5.56 magazine will drop into the well.
// 10 Things Worth Knowing
A .350 Legend will not clear a 5.56 muzzle device.
Ballistic Advantage state it plainly for this barrel: a standard 5.56 1/2×28 flash hider does not leave enough bore clearance for a .350 round to pass. The Cross Machine Tool CRC-M-9MM fitted here is a 9mm device on the same 1/2×28 thread, so the bore is right for the cartridge. This is a fitment requirement, not a preference — a .350 Legend round should drop freely through any muzzle device fitted to this rifle.
The trigger is user-adjustable, and it ships with both springs.
The LaRue Tactical MBT-2S is machined from S7 tool steel and breaks at 4.5 lb total — a 2.5 lb first stage and a 2 lb second stage. LaRue supply a heavier trigger spring alongside it that takes the total to 6 lb for duty use. Changing it is a spring swap the owner can do. The 6.5 Grendel WARTHOG carries the same fire control group and the same pair of springs.
Second of Ten does not modify engagement surfaces.
Both pull weights above are LaRue’s, obtained by fitting the spring LaRue supply for the purpose. We do not stone, polish or alter sear engagement to chase a lighter break. If a lighter trigger is what you want, the answer is a different trigger, not a modified one.
The bolt carrier group is a standard 5.56 group, and that is correct.
Because the .350 shares the .223 rim diameter it headspaces on an unmodified 5.56 bolt face. The Toolcraft group fitted here runs a Carpenter No. 158 bolt in an 8620 carrier, shot peened and MPI, DLC coated. C158 is the steel specified for the military bolt and is the option here rather than 9310.
Both Second of Ten index marks are fitted to this group.
A line is scribed across the gas key and onto the carrier, and the cam pin is marked with an arrow. Neither adds strength; both make a condition visible without disassembly. On the gas key the line is continuous when the screws are where they were staked, so a broken line is a screw backing out. On the cam pin the arrow removes the guesswork on reassembly — the point faces toward the bolt face.
If the gas key line no longer lines up, stop using the bolt carrier group.
An out-of-index line means a gas key screw is moving. Have the group inspected by a knowledgeable gunsmith, or contact [email protected] for a replacement if it was bought from us. The mark is only worth having if it is acted on.
Marking the group does not cost you the manufacturer’s warranty.
Toolcraft’s lifetime warranty remains in effect with our index marks fitted; the marks are scribed, not a coating, and it is third-party coating that Toolcraft exclude. Regardless of who ends up answering for a part, Second of Ten will facilitate the repair or replacement and honour the warranty.
Standard AR-15 magazines are not a substitute.
The straight-walled case is wider than a .223 and needs the correct internal geometry and feed lips. The three DuraMag stainless magazines supplied — two five-round and one ten-round — are built for the cartridge. A 5.56 magazine will not feed it reliably even though it fits the magazine well.
The barrel takes a .750″ low-profile gas block and nothing else.
The Hanson profile is machined with a 1.015″ gas block seat for .750″ low-profile blocks only, and it ships pinned. Ballistic Advantage also state that Hanson barrels are not designed to work with aftermarket piston kits — worth knowing before anyone plans a conversion.
The lower is rollmarked CAL: MULTI, and this rifle is chambered .350 Legend.
The Sharps Bros WARTHOG carries a multi-caliber mark, which is the marking of record on the serialised part. The chambering belongs to the barrel and is engraved on the ejection port cover. The two are not in conflict — but read the barrel, not the receiver.
// Specification
- Model
- SOT WARTHOG 350 *
- Chambering
- .350 Legend
- Barrel
- 16″ BA Hanson, 1:16 CrMoV · QPQ · carbine length · 1/2×28
- Gas block
- .750″ low profile, pinned
- Gas tube
- Stainless steel, carbine length
- Muzzle device
- CMT CRC-M-9MM 9mm bore, required for .350 Legend
- Upper receiver
- SOTM4 billet
- Port cover
- Caliber engraved, black Cerakote®
- Charging handle
- Breek Arms Mod 2
- Handguard
- 15″ SOT Wedge-Lock M-LOK
- Bolt carrier group
- Toolcraft DLC Carpenter 158 bolt · 8620 carrier
- Bolt
- Carpenter No. 158 Shot peened · MPI
- Gas key
- SOT index marked Staked as supplied
- Cam pin
- SOT arrow index marked Point toward the bolt face
- Lower receiver
- Sharps Bros WARTHOG 7075-T6 billet · hard coat anodized
- Lower rollmark
- MDL: WARTHOG · CAL: MULTI
- Takedown pins
- Nitride
- Trigger
- LaRue Tactical MBT-2S Curved bow · S7 tool steel
- Trigger pull
- 4.5 lb — 2.5 lb + 2.0 lb 6 lb with the supplied heavy spring
- Selector
- Radian Weapons Talon Ambidextrous
- Bolt catch
- Geissele Automatics Maritime
- Stock
- Reptilia RECC·E™ Carbine
- Grip
- Reptilia CQG™
- Finish
- Black Bush Hog Camo Cerakote® Also anodized black, FDE Cerakote®, black & green tiger stripe, custom Cerakote®
- Magazines
- DuraMag stainless .350 Legend Two 5-round, one 10-round, supplied
- Case
- Plano Rustrictor™ Custom fitted foam, supplied
- Price
- $2,600.00 Retail · cased, with magazines
// Before You Order
Read the barrel, not the receiver.
The lower is rollmarked CAL: MULTI. That is the marking of record for the Sharps Bros receiver, not a statement of chambering. This firearm is chambered .350 Legend, engraved on the ejection port cover.
Muzzle devices do not swap between the two WARTHOG rifles.
This barrel is threaded 1/2×28 and carries a 9mm-bore device; the 6.5 Grendel rifle is 5/8×24. Any device fitted here must pass a .350 Legend round freely.
Magazines are cartridge-specific.
Three DuraMag .350 Legend magazines are supplied. A 5.56 magazine fits the well and will not feed the cartridge.
A Title I rifle with a 16″ barrel.
Transfers through a licensed dealer; no NFA registration, tax stamp or waiting period applies to the firearm itself.
Warranty.
Built, headspaced and function checked by Second of Ten and warranted as a complete rifle. Component manufacturers’ warranties pass through in full; where they run broader than ours, we act as the owner’s agent in a claim. Our index marks do not void Toolcraft’s lifetime warranty on the bolt carrier group.
// Inspect It Yourself
Both sides and the case, photographed and zoomable to 8×.
The inspection page shows this specific rifle rather than a rendering: the Bush Hog Camo pattern, the caliber-engraved port cover, the Sharps Bros address block and serial position, the pinned gas block, both index marks and the cased presentation as delivered are all readable at magnification, and the serial number is the only thing retouched. If a line in the specification above matters to you, go and look at it.
ZOOM 8×
01 · Right side
02 · Left side
03 · Cased, as delivered
Open the viewer →
SOT_WARTHOG-350-16_BBHC_Rifle_Zoom_Viewer.html · SOT-WEB-RFL-015 · doc ID provisional pending SOT-DCR-001
// Further Reading
16″ SOT WARTHOG — 6.5 Grendel The same rifle, the other cartridge 16″ Sharps Bros GOLDEN HOG — .223 Wylde Shares the receiver and nothing else WARTHOG Series All three rifles on the Sharps Bros WARTHOG lowerOne rifle. The cartridge is the only question.
Bombproof by Design™ and Gundaddy® are marks of Second of Ten LLC. Cerakote® is a mark of NIC Industries, Inc.; M-LOK™ is a trademark of Magpul Industries Corp.; WARTHOG is a model of Sharps Bros Mfg., who manufacture, rollmark and serialise the lower receiver as the model of record. Toolcraft, Ballistic Advantage, Breek Arms, Cross Machine Tool, DuraMag, Geissele Automatics, LaRue Tactical, Plano, Radian Weapons and Reptilia marks are the property of their owners. Other marks are the property of their owners; their appearance indicates that Second of Ten incorporates the component, not sponsorship, affiliation or endorsement. Specifications describe the configuration shown and are subject to change without notice. Serial values are blurred in published photography; address and model markings are not retouched.