20″ SOTM5 .308 WIN PRS LITE RIFLE, FDE CERAKOTE®
A large-frame rifle specified one part at a time.
$2,650.00 SKU RFL-M5-308-B200-FDE
The SOTM5 PRS Lite .308 is a 20″ .308 Winchester rifle built on Second of Ten’s billet SOTM5 receivers: a thermal-fitted MOD-0FA 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. Upper, lower, handguard and ejection port cover are finished in FDE Cerakote®.
A note on the name
SOTM5 names the rifle; the serialized part is the lower receiver. MOD-0FA names the billet upper fitted to it, the forward assist version of the MOD-0. PRS Lite identifies the stock configuration, built with the Magpul PRS® Lite.
//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 Ballistic Advantage 20″ .308 Winchester Heavy Profile barrel from the Modern Series, 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
20″ Ballistic Advantage Modern Series .308 Winchester barrel in a heavy profile: chrome moly vanadium, QPQ finished, 1:10 twist, rifle-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-0FA 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 barrel, so the joint between barrel and receiver is an interference fit and not a slip fit.
A forward assist that stays put
The MOD-0FA keeps the forward assist, phosphate finished and retained by a threaded forward assist pin.
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. 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 dual-ejector bolt carrier group
KAK Industries LR-308 double ejector group: an 8620 steel carrier with its outside rails, bolt runs and gas bores ground to .0002″, and a 9310 steel dual ejector bolt, phosphate finished, MPI tested and marked. A high-pressure firing pin and an O-ring extractor helper are fitted.
A gas key that stays on
The heat-treated 4130 gas key is secured with Grade 8 fasteners, torqued to spec, and staked with a hydraulic staking machine, with sealant between the key and the carrier.
Caliber marked on the cover
The ejection port dust cover is engraved .308 WIN and finished in FDE Cerakote® to match the receivers.
A two-stage trigger, left as made
LaRue Tactical MBT-2S two-stage trigger with a straight 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 with the rifle. 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 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 is modular: it 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.
A recoil system specified part by part
SOT SR25/A5-style 9-position receiver extension with numbered index markings, black anodized, on a Mil-Spec phosphate-finished castle nut, with a standard rifle-length buffer, the JP Enterprises Tuned and Polished Extra Power Large Frame Rifle Buffer Spring (JPS-OSR-308), and a Forward Controls Design RBF reinforced buffer retainer, a small part that takes repeated impact on a large-frame rifle.
Furniture for shooting from position
Magpul PRS® Lite stock, with length of pull and comb height adjustable, and a MIAD® GEN 1.1 TYPE 2 grip, both in FDE, on a billet lower with Battle Arms Development enhanced AR-308 steel pivot and takedown pins.
//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_SOTM5-20-308-PRSL_FDE_Rifle_Zoom_Viewer.html · SOT-WEB-RFL-029
ZOOM 5×
//Specifications
- Model
- SOTM5 · 20″ PRS Lite rifle
- SKU
- RFL-M5-308-B200-FDE
- Chambering
- .308 Winchester
- Overall length
- 41.5″
- Weight
- 10 lb
- Barrel
- 20″ Ballistic Advantage Modern Series, heavy profile · 1:10 twist · 55.5 oz
- Barrel steel and finish
- Chrome moly vanadium · QPQ corrosion resistant
- Chamber
- .308 Winchester, DPMS style
- Barrel extension
- QPQ-coated M4 feed ramp extension
- Muzzle
- Threaded 5/8×24 · Faxon Gunner 7.62 MuzzLok® 3-port brake, removable · direct-thread suppressor ready with the brake removed
- Gas system
- RIFLESPEED adjustable · gas block pinned to the barrel · rifle length · .750″ gas block journal
- Handguard
- 15″ SOT Wedge-Lock, M-LOK®, free float · FDE Cerakote®
- 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-0FA billet · 7075-T6 aluminum · LR-308 DPMS high pattern · laser-engraved T-marks · dry film lubed · thermal fitted · FDE Cerakote®
- Forward assist
- Phosphate finished · threaded forward assist pin
- Charging handle
- Breek Arms WARHAMMER Mod2, AR-10 / LR-308 · Flat Dark Earth · oversize ambidextrous latches
- Dust cover
- Engraved .308 WIN · FDE Cerakote®
- Bolt carrier group
- KAK Industries LR-308 double ejector · 8620 steel carrier, full-auto profile · 18 oz
- Bolt
- 9310 steel, dual ejector, phosphate finish · MPI tested and marked · high-pressure firing pin
- Gas key
- 4130 steel, heat treated · Grade 8 fasteners, torqued · hydraulically staked
- Lower receiver
- SOTM5 billet, marked MULTI · 7075-T6 aluminum · Type III hard anodized · FDE Cerakote® · upper receiver tension screw
- Lower details
- Threaded bolt catch pin · rear takedown detent spring with set screw
- Trigger
- LaRue Tactical MBT-2S, two-stage, straight 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
- SOT SR25/A5-style, 9-position, numbered index markings · black anodized
- Buffer
- Standard rifle length
- Buffer spring
- JP Enterprises Tuned and Polished Extra Power Large Frame Rifle Buffer Spring (JPS-OSR-308)
- Castle nut
- Mil-Spec · phosphate finished
- Buffer retainer
- Forward Controls Design RBF, reinforced
- Stock
- Magpul PRS® Lite · FDE
- Grip
- Magpul MIAD® GEN 1.1 TYPE 2 · FDE
- Magazine
- Magpul PMAG® 20 LR/SR GEN M3™, included
- Finish
- FDE Cerakote®: upper, lower, handguard and ejection port cover
- Price
- $2,650.00
//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 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. Ballistic Advantage, Battle Arms Development, Breek Arms, Faxon Firearms, Forward Controls Design, KAK Industries, LaRue Tactical, Magpul, NIC Industries, Radian Weapons and RIFLESPEED names and marks, including Cerakote®, MuzzLok®, MBT-2S, M-LOK®, MIAD®, PMAG®, GEN M3™, PRS® and Talon®, are the property of their respective owners. Their appearance indicates that Second of Ten incorporates the component, not sponsorship, affiliation or endorsement.