Build template
Lightweight Recce
Go further with less fatigue
This is a reconnaissance rifle in the original sense of the term: a lightweight carbine wearing real magnified glass, built on the KE Arms WWSD 2020 for a shooter who carries a rifle far more than they shoot it. The WWSD starts at about 5 pounds unloaded, nearly 2 pounds lighter than a standard AR-15, and that head start is what buys the weight budget for a proper optic.
The recce concept has always been a scoped rifle, going back to the Navy's lightweight 16-inch builds that paired a pencil barrel with variable glass. In the woods, the limiting factor is not how fast you can hose a target at 10 yards, it is whether you can identify and hit something at 300. A first focal plane 1-8x and a thrower of a weapon light answer that; a bare micro dot does not.
Every part below shows its current price, and the full configuration loads into the builder in one click so you can add or subtract to match your mission. The WWSD uses KE Arms' one-piece KP-15 polymer lower with an integral stock, which is a large part of where its weight savings come from.
Base platform
Why this build
The KE Arms WWSD 2020 is a genuine rethinking of the AR-15 rather than a parts pile, and its weight is the whole argument. The KP-15 polymer lower with an integral fixed stock, a 16-inch pencil-profile barrel on a mid-length gas system, a carbon fiber handguard, and a JP Silent Capture Spring combine to hit roughly 5 pounds while staying well-balanced and controllable. Starting 2 pounds under a standard AR is what lets this build carry real glass and a light and still come out at the weight of an ordinary flat-top carbine with a red dot.
The Primary Arms PLxC 1-8x24 is the optic that makes it a recce rifle. At 16.95 ounces and 9.28 inches it is one of the lightest and shortest 1-8x FFP scopes made, the ACSS reticle works like a dot at 1x and gives real holdovers as magnification climbs, and the Japanese ED glass resolves targets at distances where a 2 MOA dot is just a red smear. The Aero Precision Ultralight mount carries it for 3.27 ounces, roughly half the weight of the usual billet cantilever mounts.
The SureFire M340DFT-PRO Turbo Mini Scout rounds it out, because positive identification does not keep daylight hours. It throws 95,000 candela from a 5.11-ounce body, which reaches across a field, not just a hallway. Optic, mount, and light together add about a pound and a half to the bare rifle, and that is the whole accessory list. The result still slings lighter than most duty guns do empty.
Parts list
Optics & Sighting
$1,749.99 at Optics Planet · In stock
The Primary Arms PLxC 1-8x24 FFP is the lightest serious answer to the recce optic question: 16.95 ounces, 9.28 inches, Japanese ED glass, and a class-leading 121-foot field of view at 1x. The first focal plane ACSS reticle holds like a red dot down close and delivers accurate mil holdovers at 8x, so one optic covers everything from a snap shot at 25 yards to identifying and engaging at the far side of a clearcut.
The SLx 1-6x Gen IV gives up FFP, some glass, and two power levels but keeps the LPVO concept intact at a fraction of the price.
The Micro T-2 is the pure-weight play at about 3 ounces if your ground never opens past 200 yards and every ounce matters more than magnification.
Scope Mounts & Rings
$98.99 at MidwayUSA · Out of stock
The Aero Precision Ultralight 30mm mount weighs 3.27 ounces, roughly half of the usual billet cantilever mounts, which is exactly the hardware a WWSD deserves. The cantilever puts the PLxC at proper eye relief over a fixed-stock rifle, and the cross-slot keyway keeps it planted under recoil. Know the trade you are making: the 6061 aluminum that makes it this light is not the 7075 of premium mounts, and a hard drop onto the optic can shift your zero. It holds zero fine through normal field use and recoil; treat the rifle gently around rocks and truck beds, and confirm zero after any real impact.
The Scalarworks LEAP/07 upgrades to 7075 construction that shrugs off drops, plus quick-detach levers, while staying remarkably light.
Illumination
$358.49 at Optics Planet · In stock
The SureFire M340DFT-PRO Turbo Mini Scout is the recce light: 650 lumens focused into 95,000 candela of throw from a body that weighs 5.11 ounces with its battery. That beam identifies a target across a field at distances that match what the 1-8x can see, and the dual-fuel design runs a rechargeable SF18350 with a common 123A as the backup cell. It tucks against the WWSD's slim carbon handguard without overhang.
The ProTac HL-X delivers 1,000 lumens of flood-pattern light with included mounting hardware at a third of the price, traded against far less reach.
Magazines & Feeding
$15.49 at Optics Planet · Out of stock
The Magpul PMAG 30 Gen M3 is the reliable default: a four-way anti-tilt follower, crush-resistant polymer, and a low price that lets you carry several. On a field rifle it survives being dropped on rock and stored loaded without complaint.
The lightweight DURAMAG SPEED uses a slim aluminum body, making it the current metal-mag alternative for backcountry carry.
Slings & Retention
$36.75 at Optics Planet · In stock
At six ounces the Magpul MS1 keeps faith with the WWSD concept: nothing on the rifle that does not earn its weight. The MS1 slider gives the same fast, no-slip length adjustment as slings costing twice as much, and the snag-free design has no dangling tails to catch brush on a long walk.
The Ferro Slingster is lighter still at around 3.5 ounces and adds a movable pad for the shoulder.
Current build cost $3,959.70
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Frequently Asked Questions
▶How light is the WWSD 2020 compared to a standard AR-15?
▶Why an LPVO instead of a red dot on a lightweight build?
▶Can I put a different grip or stock on the WWSD's KP-15 lower?
▶Is a pencil barrel accurate enough for a recce rifle?
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