16″ SOT WARTHOG 6.5 GRENDEL
On the Sharps Bros WARTHOG billet lower
WARTHOG Series · Model SOT WARTHOG 65G · Two calibers, one rifle
Two calibers on one rifle. This is the reach.
- Chambering
- 6.5 Grendel, Type 2
- Barrel
- 16″ BA SPR, 416R
- Gas
- Mid-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 .350 Legend 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. On this rifle that means a 16″ Ballistic Advantage SPR profile in 416R stainless, bead blasted, cut to a Type 2 chamber with a 1:8 twist, on mid-length gas — a longer dwell for a longer, heavier cartridge, which is the standard arrangement on a 16″ Grendel. Folding Magpul MBUS® 3 sights are fitted front and rear.
// Why The Bolt Has To Change
The Grendel case head is larger, so a 5.56 bolt face will not chamber it.
The 6.5 Grendel uses the larger 7.62×39-pattern case head, which means a 5.56 bolt face physically cannot chamber it. What runs here is a Microbest all-chrome carrier fitted with a Faxon 9310 Type 2 (.136″) bolt: the carrier is caliber-agnostic, the bolt is not.
That is the opposite situation from the .350 Legend WARTHOG, which runs an unmodified 5.56 bolt face because the .350 shares the .223 rim diameter. On this platform the bolt face is a specification, not a preference.
The Faxon bolt brings 9310 tool steel, full mil-spec heat treatment, shot peening, magnetic particle inspection and salt bath nitriding, with the backs of the lugs chamfered and an S7 tool steel extractor assembled with spring, insert and a Crane O-ring. Its Type 2 (.136″) bolt face matches the barrel’s Type 2 chamber, which is the pairing that has to be right on a Grendel. Note that the finishes differ by design — the carrier is hard chrome and the bolt is nitride, because the bolt was chosen for the cartridge rather than to match the carrier.
// 12 Things Worth Knowing
The bolt is a Grendel bolt, and it has to be.
The Grendel uses the larger 7.62×39-pattern case head, so a 5.56 bolt face will not chamber it. A Microbest all-chrome carrier carries a Faxon 9310 Type 2 (.136″) bolt — carrier caliber-agnostic, bolt not. On this platform the bolt face is a specification, not a preference.
What the Faxon bolt brings.
9310 tool steel, full mil-spec heat treatment, shot peened, magnetic particle inspected, salt bath nitrided, lug backs chamfered, and an S7 tool steel extractor assembled with spring, insert and a Crane O-ring. The Type 2 bolt face matches the barrel’s Type 2 chamber, which is the pairing that has to be right on a Grendel.
The carrier and the bolt are deliberately different finishes.
The carrier is hard chrome and the bolt is nitride. That is not a mismatch to be explained away — the bolt was chosen for the cartridge rather than to match the carrier, and saying so is more useful than pretending the set was finished together.
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; nothing is stoned, polished or reprofiled to get there.
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.
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.
The marks are scribed, not a coating. Second of Ten will facilitate the repair or replacement and honour the warranty regardless of who ends up answering for a part.
The back-up sights are Magpul MBUS® 3, front and rear.
Impact-resistant polymer, spring-loaded with ambidextrous push-button deployment, standard AR sight height when up, tool-less adjustment — elevation at the front, windage at the rear, two front post widths and two rear apertures. Folded they clear the optic rail: 0.47″ front, 0.55″ rear. Magpul specify the front sight must sit on the handguard rail on the same plane as the receiver and not on a railed gas block, because of the heat; that is where it is mounted.
The muzzle thread is 5/8×24, not the 1/2×28 of the .350 Legend rifle.
The barrel is cut for it and the Breek Arms 3FO is threaded to match, so a muzzle device will not swap between the two WARTHOG rifles. The 3FO also carries an outside thread that accepts a Breek Arms blast shield, which turns the flash hider into a forward blast diverter without removing it.
This is a Type 2 chamber, and the magazines are Grendel magazines.
Type 2 is the current 6.5 Grendel standard and is what the barrel is cut to. The two 17-round E-Lander steel magazines supplied are built for the cartridge; a 5.56 magazine will not feed it even though it fits the magazine well.
The barrel takes a .750″ low-profile gas block and it ships pinned.
The gas system is mid-length rather than the carbine length of the .350 Legend rifle — a longer dwell for a longer, heavier cartridge, which is the standard arrangement on a 16″ Grendel.
// Specification
- Model
- SOT WARTHOG 65G *
- Chambering
- 6.5 Grendel Type 2 chamber
- Barrel
- 16″ BA SPR, 1:8 416R stainless · bead blasted · mid-length · 5/8×24
- Gas block
- .750″ low profile, pinned
- Gas tube
- Stainless steel, mid-length Length follows the gas system
- Muzzle device
- Breek Arms 3FO Three prong · outside threaded for a blast shield
- Upper receiver
- SOTM4 billet
- Port cover
- Caliber engraved, black Cerakote®
- Charging handle
- Breek Arms Mod 2
- Handguard
- 15″ SOT Wedge-Lock M-LOK
- Sights
- Magpul MBUS® 3, front and rear MAG1166 / MAG1167 · folding, tool-less
- Carrier
- Microbest all-chrome 8620 · M16 cut · chrome-lined bore
- Bolt
- Faxon 9310, nitride Type 2, .136″ · MPI · S7 extractor · FF65GBCNITRIDE
- 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
- E-Lander 6.5 Grendel steel 17 round · two supplied
- Case
- Plano Rustrictor™ hard case 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. The chambering belongs to the barrel and is engraved on the ejection port cover.
Muzzle devices do not swap between the two WARTHOG rifles.
This barrel is threaded 5/8×24; the .350 Legend rifle is 1/2×28 with a 9mm-bore device. They are not interchangeable.
Magazines are cartridge-specific.
Two 17-round E-Lander steel Grendel 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 are scribed rather than coated and do not affect component warranties.
// 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 mid-length gas block, the folded MBUS® 3 sights, 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-65G-16_BBHC_Rifle_Zoom_Viewer.html · SOT-WEB-RFL-016 · doc ID provisional pending SOT-DCR-001
// Further Reading
16″ SOT WARTHOG — .350 Legend 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. Ballistic Advantage, Breek Arms, E-Lander, Faxon Firearms, Geissele Automatics, LaRue Tactical, Magpul, Microbest, 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.