18″ SOTM5 .308 WIN RIFLE, CHOCOLATE CHIP CERAKOTE®
A large-frame rifle specified one part at a time.
$3,360.00 SKU RFL-M5-308-B180-CC
This SOTM5 is an 18″ .308 Winchester rifle built on Second of Ten’s billet SOTM5 receivers: a thermal-fitted MOD-0 upper over a 7075-T6 aluminum lower. The barrel, gas system, bolt, recoil parts and controls are each chosen for this cartridge and this role, and each is named below. Receivers, handguard, buffer tube, stock and grip are finished in chocolate chip Cerakote®.
A note on the name
SOTM5 names the rifle; the serialized part is the lower receiver. MOD-0 names the billet upper fitted to it. Chocolate chip names the hand-applied desert camouflage, so the pattern differs from rifle to rifle.
//The Barrel
The barrel is the part of this rifle that most decides how it shoots, so it is the part chosen first. Second of Ten fits the Faxon Match Series 18″ heavy fluted .308 Winchester barrel, and these are the features of it that matter.
//The Handguard
A free-float handguard only helps if it stays where it was put. The 15″ SOT Wedge-Lock M-LOK® handguard is built around that.
//The Case
The barrel comes first
18″ Faxon Match Series heavy fluted .308 Winchester barrel in 416-R stainless, 5R button rifled, 1:10 twist, QPQ nitrided bore and exterior. The rest of the rifle is specified around it; the detail is set out above.
A thermal-fitted billet upper
The SOTM5 MOD-0 upper is machined from a solid billet of 7075-T6 aluminum to the LR-308 DPMS high pattern, with laser-engraved T-marks on the top rail. It is thermal fitted to the barrel, so the joint between barrel and receiver is an interference fit and not a slip fit. It keeps the forward assist.
Gas you can set, on a block that cannot move
A RIFLESPEED adjustable gas system lets the rifle be tuned to the load and to a suppressor instead of running over-gassed. The gas block is pinned to the barrel, in line with the Bombproof by Design™ philosophy: a pinned block cannot shift the way one held by clamping or set screws alone can.
A bolt carrier group for .308
DPMS Gen 1 LR-308 pattern group with a shot-peened Carpenter 158 bolt and an SAE 8620 carrier. The gas key is chrome lined, torqued and staked; the cam pin and extractor are heat treated and the firing pin is precision ground.
Nickel boron, end to end
The bolt, carrier, extractor, gas key and cam pin are all nickel boron (NiB) plated: a hard, slick surface that wipes clean of carbon.
A brake that comes off
The Faxon Gunner 7.62 MuzzLok® brake is held by a MuzzLok nut, not a crush washer, so it can be timed and removed in the field. Take it off and the 5/8×24 thread is ready for a direct-thread suppressor.
Caliber marked on the cover
The ejection port dust cover is engraved .308 WIN with the Second of Ten crest, so the caliber reads at a glance with the cover closed.
A two-stage trigger, left as made
LaRue Tactical MBT-2S two-stage trigger with a curved bow: 4.5 lb, 2.5 lb first stage and 2.0 lb second. Second of Ten does not stone, polish or alter sear engagement surfaces.
Controls on both sides
Ambidextrous bolt release, with an enlarged paddle-style bolt catch on the left and Second of Ten’s own serrated release on the right. Ambidextrous magazine release with an enlarged left-side catch. Radian Weapons Talon® ambidextrous safety selector and a Breek Arms Warhammer Mod 2 AR-10 charging handle with oversize latches on both sides.
A recoil system specified part by part
Carbine-length, Mil-Spec diameter receiver extension in chocolate chip Cerakote®, an LR-308 carbine heavy buffer with solid tungsten weights to settle bolt bounce, and a JP Enterprises tuned and polished AR-10 / LR-308 buffer spring, with an HM Defense QD end plate.
Tension where the halves meet
Every SOTM5 billet lower carries a nylon-tipped upper tension screw that takes up play between the receivers. Enhanced LR-308 takedown and pivot pins in steel, with low-profile heads that clear the ambidextrous selector.
Furniture in the rifle’s finish
Magpul STR® Mil-Spec carbine stock, with two storage tubes and an integral QD sling mount, and a Magpul MOE-K2® grip, both Cerakoted in the same chocolate chip pattern as the rifle.
//Inspect It Yourself
This rifle has a zoomable inspection page showing both sides of the rifle as built, so the markings and machining can be read from the photograph instead of taken from a spec table. The serial number is blurred; no other marking is altered.
Open the viewer → SOT_SOTM5-18-308_CC_Rifle_Zoom_Viewer.html · SOT-WEB-RFL-028
ZOOM 5×
//Specifications
- Model
- SOTM5 · 18″ rifle
- SKU
- RFL-M5-308-B180-CC
- Chambering
- .308 Winchester
- Overall length
- 36.5″ collapsed · 40.5″ extended
- Weight
- 9 lb 2 oz
- Barrel
- 18″ Faxon Match Series, heavy fluted · 1:10 right-hand twist · 5R button rifled · 18.125″ breech face to muzzle · 2.25 lb
- Barrel steel and finish
- 416-R stainless steel · salt-bath QPQ nitride, bore and exterior · wet magnetic particle inspected before nitriding
- Chamber
- .308 Winchester, CMM-checked · headspace 100% checked with a go/no-go gauge (Faxon)
- Barrel extension
- DPMS LR-308 pattern · NP3 nickel-Teflon coated · torqued to 150 ft-lb and pinned by Faxon
- Muzzle
- Threaded 5/8×24 · target crown · Faxon Gunner 7.62 MuzzLok® 3-port brake installed, removable for a direct-thread suppressor
- Gas system
- RIFLESPEED adjustable · gas block pinned to the barrel · rifle length · .093″ port
- Handguard
- 15″ SOT Wedge-Lock, M-LOK®, free float
- Handguard construction
- 6061-T6 aluminum · full-length top Picatinny rail · M-LOK® on seven sides · steel HD barrel nut · Grade 8 hardware · 14.4 oz
- Upper receiver
- SOTM5 MOD-0 billet · 7075-T6 aluminum · LR-308 DPMS high pattern · laser-engraved T-marks · thermal fitted · forward assist
- Charging handle
- Breek Arms Warhammer Mod 2, AR-10 · oversize ambidextrous latches
- Dust cover
- Engraved .308 WIN, with the SOT crest
- Bolt carrier group
- DPMS Gen 1 LR-308 pattern · nickel boron (NiB) plated bolt, carrier, extractor, gas key and cam pin · SAE 8620 carrier · chrome-lined gas key, torqued and staked
- Bolt
- Carpenter 158 steel, shot peened · heat-treated cam pin and extractor · precision-ground firing pin
- Lower receiver
- SOTM5 billet · 7075-T6 aluminum · upper tension screw · rollmarked MOD: SOT M5 · CAL: MULTI
- Trigger
- LaRue Tactical MBT-2S, two-stage, curved bow · 4.5 lb (2.5 lb first stage, 2.0 lb second)
- Receiver extension
- Carbine length, Mil-Spec diameter · chocolate chip Cerakote®
- Buffer
- LR-308 carbine heavy · solid tungsten weights
- Buffer spring
- JP Enterprises, tuned and polished, AR-10 / LR-308 carbine
- End plate
- HM Defense QD end plate
- Safety selector
- Radian Weapons Talon®, ambidextrous
- Takedown and pivot pins
- Enhanced LR-308 · steel
- Bolt release, left
- Enlarged paddle-style bolt catch
- Bolt release, right
- SOT proprietary, serrated
- Magazine release
- Ambidextrous · enlarged left-side magazine catch release
- Stock
- Magpul STR® carbine, Mil-Spec · chocolate chip Cerakote®
- Grip
- Magpul MOE-K2® · chocolate chip Cerakote®
- Magazine
- Magpul PMAG® 20 LR/SR GEN M3™, plain and unmarked, included · magazines shown in photographs may differ
- Options
- Magpul MBUS 3 front & rear flip-up sights, black (MAG1166-MAG1167), +$75.00 · Lancer Systems Gen 2 L7AWM® 20-round magazine, Translucent Dark Earth or Translucent Smoke, in place of the standard magazine, +$20.00
- Finish
- Chocolate chip Cerakote®: receivers, handguard, buffer tube, stock and grip · barrel nitride · controls black
- Price
- $3,360.00
//Notices
Set the gas for the load
The adjustable gas system should be set for the ammunition in use and reset when a suppressor is fitted or removed. A setting that suits one load is not necessarily right for another.
The camouflage is applied by hand
Cerakote® camouflage is applied by hand, so the pattern on the rifle you receive will differ from the one photographed.
Photography © Second of Ten LLC. Breek Arms, Faxon Firearms, HM Defense, JP Enterprises, Lancer Systems, LaRue Tactical, Magpul, NIC Industries, Radian Weapons and RIFLESPEED names and marks, including Cerakote®, MuzzLok®, MBT-2S, M-LOK®, MOE-K2®, L7AWM®, MBUS®, PMAG®, GEN M3™, STR® and Talon®, are the property of their respective owners. Their appearance indicates that Second of Ten incorporates the component, not sponsorship, affiliation or endorsement.