16″ SOTM5 8.6 BLACKOUT RECCE RIFLE
A large-frame rifle specified one part at a time.
$3,200.00 SKU RFL-M5-86BLK-B160-BLK
This SOTM5 is a 16″ 8.6 Blackout rifle built on Second of Ten’s billet SOTM5 receivers: a thermal-fitted MOD-0 upper over a 7075-T6 aluminum lower. It is gassed to run both supersonic and subsonic 8.6 Blackout, and the barrel, gas system, bolt, recoil parts and controls are each chosen for that job and named below. The receivers are black anodized.
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, here in its no-forward-assist configuration. RECCE is Second of Ten’s word for the light reconnaissance configuration; the stock is Reptilia’s RECC·E™ Carbine Stock, and RECC·E™ is Reptilia’s mark.
//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 Duty Series 16″ 8.6 Blackout barrel in the Gunner profile, 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 12.625″ Midwest Industries 308 Combat Rail M-LOK® is built around that.
//The Case
The barrel comes first
16″ Faxon Duty Series 8.6 Blackout barrel in the Gunner profile: 4150 CMV, QPQ nitrided, 1:3 twist, carbine-length gas. 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 7075-T6 aluminum billet to the LR-308 DPMS high pattern, with laser-engraved T-marks and a dry film lubed interior. It is thermal fitted to the Faxon barrel, so the joint between barrel and receiver is an interference fit and not a slip fit.
No forward assist, by design
This rifle uses the no-forward-assist configuration of the MOD-0, with the forward assist bore closed by a threaded forward assist pin.
One rifle, both kinds of 8.6
8.6 Blackout is loaded both supersonic and subsonic, and a fixed gas port suits only one of them. The RIFLESPEED gas control lets the rifle be set for each, and for a suppressor, on a block pinned to the barrel so the setting cannot be lost to a block that moves.
A superfinished bolt carrier group
Faxon Superfinished AR10 BCG, Gen 2, nitride, rated for .308 Win, 6.5 Creedmoor and 8.6 Blackout: MIL-SPEC 8620 carrier, superfinished and QPQ nitrided; 9310 bolt, shot peened and MPI tested; S7 extractor with nested .308 springs and O-ring; 4140 cam pin; heat-treated 4140 gas key on Grade 8 fasteners, fully staked.
Caliber marked inside and out
The ejection port dust cover is engraved with the caliber on both the interior and the exterior. The marking reads whether the cover is open or closed.
A buffer that takes energy out
A KynSHOT RB5005 hydraulic buffer with a Tubb Precision flatwire rifle-length spring. Every other buffer moves energy around inside the rifle; a hydraulic damper converts some of it to heat. KYNTEC builds it in 17-4 stainless, rated −30°F to +150°F, for AR-10 and A5-length tubes, and the claim with real weight behind it is reduced bolt bounce.
A two-stage trigger, left as made
LaRue Tactical MBT-2S two-stage trigger with a curved bow. It breaks crisply at 4.5 lb (2.5 lb first stage, 2.0 lb second) with a smooth and positive reset. An additional heavy trigger spring that raises the pull to 6 lb is included. Second of Ten does not stone, polish or alter sear engagement surfaces.
Controls on both sides
Ambidextrous bolt release, with a paddle-style oversized bolt catch on the left and Second of Ten’s own serrated release button on the right. Extended left-side magazine catch release with a right-side button. Breek Arms WARHAMMER Mod2 AR-10 charging handle with oversize latches on both sides.
A selector you can set to 45° or 90°
The Radian Weapons Talon® 45/90 ambidextrous safety selector runs as a standard 90° selector or as a 45° short throw by rotating the shaft 180° inside the lower. It is installed and configured at 90° and can be reconfigured by the end user.
Tension where the halves meet
The billet lower carries an upper receiver tension screw, a threaded bolt catch pin and a rear takedown detent spring with set screw, with Battle Arms Development enhanced AR-308 steel pivot and takedown pins.
A stock that keeps its cheek weld
Reptilia RECC·E™ Carbine Stock for SR-25 / A5 / AR-10, with its own SR-25/A5-length 7075-T6 receiver extension: length of pull 12.375″ to 15″ with a constant cheek weld, switchable QD points, 12.8 oz with the tube. Paired with a Magpul MIAD® GEN 1.1 TYPE 2 grip, with taller backstraps for 7.62×51 receivers.
//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_SOTM5-16-86BLK-RECCE_BLK_Rifle_Zoom_Viewer.html · SOT-WEB-RFL-032
ZOOM 5×
//Specifications
- Model
- SOTM5 · 16″ RECCE rifle
- SKU
- RFL-M5-86BLK-B160-BLK
- Chambering
- 8.6 Blackout
- Overall length
- 35″ collapsed · 38″ extended
- Weight
- 8 lb 3.2 oz
- Barrel
- 16″ Faxon Duty Series, Gunner profile (10A863C16NGQ) · 16.13″ · 1:3 right-hand twist · 5-groove button rifled · 2.2 lb
- Barrel steel and finish
- 4150 CMV · salt-bath QPQ nitride, bore and exterior · wet magnetic particle inspected
- Chamber
- 8.6 Blackout, cut to the cartridge drawing · headspace 100% checked with a go/no-go gauge (Faxon)
- Barrel extension
- DPMS Gen 1 pattern .308 · torqued to 150 ft-lb and pinned by Faxon
- Muzzle
- Threaded M18×1.5 · target crown · Q Cherry Bomb XL 8.6 mm brake, 17-4 stainless, 360° ports
- Gas system
- Carbine length · .104″ port · .875″ journal · RIFLESPEED adjustable gas block, numbered control knob · pinned to the barrel with a steel coil spring pin
- Handguard
- 12.625″ Midwest Industries 308 Combat Rail, M-LOK®, free float, DPMS High (MI-CR308-12.625) · black
- Handguard construction
- 6061 aluminum, hardcoat anodized · 1.50″ inside diameter · 4140 barrel nut and torque plate · anti-rotation block · five QD sockets · M-LOK® on three sides
- Upper receiver
- SOTM5 MOD-0 billet, no forward assist · 7075-T6 aluminum · LR-308 DPMS high pattern · threaded forward assist pin · laser-engraved T-marks · dry film lubed · thermal fitted · black anodized
- Charging handle
- Breek Arms WARHAMMER Mod2, AR-10 / LR-308 · black · oversize ambidextrous latches
- Dust cover
- Caliber engraved, interior and exterior
- Bolt carrier group
- Faxon Superfinished AR10, Gen 2, nitride · DPMS Gen 1 pattern · 8620 carrier, superfinished · fully staked 4140 gas key on Grade 8 fasteners
- Bolt
- 9310 steel, shot peened, MPI tested · S7 extractor, nested .308 springs and O-ring · 4140 cam pin
- Lower receiver
- SOTM5 billet, marked MULTI · 7075-T6 aluminum · Type III hard anodized, black · upper receiver tension screw
- Lower details
- Threaded bolt catch pin · rear takedown detent spring with set screw · Mil-Spec buffer retainer
- Trigger
- LaRue Tactical MBT-2S, two-stage, curved bow · 4.5 lb (2.5 lb first stage, 2.0 lb second) · 6 lb heavy spring included
- Safety selector
- Radian Weapons Talon® 45/90, ambidextrous · configured at 90°
- Takedown and pivot pins
- Battle Arms Development enhanced AR-308 pin set · steel
- Bolt release, left
- Paddle-style oversized bolt catch
- Bolt release, right
- SOT proprietary, serrated
- Magazine release
- Ambidextrous · extended left-side release · right-side button
- Receiver extension
- Reptilia SR-25/A5 length, 7075-T6 · supplied with the stock
- Buffer
- KynSHOT RB5005 hydraulic, 17-4 stainless
- Buffer spring
- Tubb Precision flatwire, rifle length
- Stock
- Reptilia RECC·E™ Carbine Stock for SR-25 / A5 / AR-10 · black · LOP 12.375″–15″
- Grip
- Magpul MIAD® GEN 1.1 Grip Kit, TYPE 2 · black
- 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
- Black anodized receivers · black hardcoat handguard
- Price
- $3,200.00
//Notices
Set the gas for the load
The RIFLESPEED gas control should be set for the ammunition in use, supersonic or subsonic, and reset when a suppressor is fitted or removed. A setting that suits one load is not necessarily right for another.
The selector is set at 90°
The Talon® 45/90 selector ships configured as a standard 90° selector. It can be changed to a 45° short throw by rotating the shaft 180° inside the lower receiver.
Photography © Second of Ten LLC. Battle Arms Development, Breek Arms, Faxon Firearms, KYNTEC, Lancer Systems, LaRue Tactical, Magpul, Midwest Industries, Q, Radian Weapons, Reptilia, RIFLESPEED and Tubb Precision names and marks, including KynSHOT, MBT-2S, M-LOK®, MIAD®, L7AWM®, MBUS®, PMAG®, GEN M3™, RECC·E™ and Talon®, are the property of their respective owners. Their appearance indicates that Second of Ten incorporates the component, not sponsorship, affiliation or endorsement.