Silverback MDRX 16" — Before You Buy | Unboxing + FPS + Range Test

Quick Answer

The Silverback MDRX 16" is an officially licensed Desert Tech replica AEG. Bullpup platform, 16" barrel, fully ambidextrous controls, three springs in the box, quick change spring system, 32 position rotary hop-up, and premium build quality throughout. 270 FPS stock with just over 1 Joule on 0.32g BBs. Hit a torso-size target at 40-45 yards right out of the box.

What's In The Box

Open the box and you're greeted with standout artwork on the outside — an exploded view of the MDRX with details throughout. Lift the lid and you get a protective foam layer with everything precisely fitted.

Read the manual first. The MDRX has MDR-specific quirks that aren't obvious out of the box. Silverback put a lot of time into covering all the details — read it before you shoot.

Everything in the box:

Instruction manual — read it
MDRX 16" with 140 round mid-cap magazine pre-inserted
Free Silverback patch
Tools and hardware for the fake charging handle
Three springs — 100N, 80N, and a lighter spring pre-installed
Additional hop-up nub for heavier weight BBs

Three springs in the box means three power levels. Pick the one that fits your field's Joule limits and swap it in with the quick change spring system — no tools, no teardown.

Licensed Trades And Unique Serial Number

Every MDRX 16" that comes out of the Silverback factory has laser-engraved Desert Tech trademarks and a unique serial number. This is an officially licensed replica — not a clone, not a copy.

If you run impressionist kits or collect licensed airsoft replicas, this is it.

Build Quality

Premium throughout. No wiggle, no rattle, solid in the hands from the moment you pick it up. The build quality reflects what you paid for.

Bullpup Platform — What That Means

The MDRX is a bullpup design — the gearbox and motor sit at the rear of the rifle. That gives you the full 16" barrel length in a significantly more compact overall package than a standard AEG with the same barrel length.

Most of the weight sits at the back of the rifle. That takes some getting used to if you're coming from a standard AEG layout, but once you adjust the handling advantage in tight spaces is significant.

Specs

Spec	MDRX 16" V3
Barrel length	16 inches
Magazine	140 round mid-cap — 7.62x51 size
Magazine compatibility	5.56 AR15 adapter available separately
Springs	100N + 80N + pre-installed (lighter) — all included
Spring system	Quick change — no tools required
Hop-up	32 position rotary — proprietary, audible click per position
Hop-up nub	Standard + heavy nub for heavier BBs both included
Fire selector	3 position ambidextrous — M4-style layout
Magazine release	3 point — push button each side + centralized rear button
Rail	Top Picatinny + M-LOK sides and bottom
Handguard	Slim — included hand stop
Battery	Limited space — Titan battery recommended
Trades	Desert Tech licensed — laser engraved, unique serial per unit

Ambidextrous Controls

The fire selector is 3 position and fully ambidextrous — safe, semi, full. The layout mirrors an M4 selector. If you're an M4 user switching to a bullpup for the first time, the MDRX is probably the most translatable bullpup on the market for that transition.

The magazine release is the standout feature. Three release points — push button on each side of the gun plus a centralized button at the rear. The rear button is the one to use in the field. Press it in, rip the mag down, pop your fresh mag in without breaking your grip or your point of aim.

The Handguard

Slim M-LOK handguard with slots on the sides and bottom — attach grips, lights, or anything else you want to run. An included hand stop comes in the box. The slim profile feels genuinely good in the hands.

The Hop-Up — Important Notes

32 position rotary hop-up with audible and tactile feedback per click. Set a position and it stays there — no guessing, no drift.

⚠️ Access note: The hop-up dial is proprietary and located under the dust cover at the rear of the gun. The dial is small. If you have gloves on or large fingers, you're going to need a tool to adjust it in the field. Set your hop-up to the range you're going to be shooting at before you go out.

An additional heavy nub is included in the box for players running heavier weight BBs.

Battery — Read This Before Buying

Battery space in the MDRX is extremely limited. The manual shows you exactly what battery shape fits. The Titan battery works well out of the box — that's the recommendation. Check the manual before buying a battery if you don't already have one.

FPS Test — Pre-Installed Spring, 0.32g BBs

270 FPS
Just over 1 Joule
Consistent across every shot

The pre-installed spring keeps you well within most field limits out of the box. The 80N and 100N springs in the box let you increase power for fields with higher Joule limits — quick change system makes it a one-minute swap.

Range Test — 40-45 Yards

Target set at 40-45 yards. Hit a torso-size target with hand-size groupings at 40 yards stock.

Semi-auto: Wider variance in groupings on a fresh gun — needs a break-in period. Run a few magazines through it before your first game.
Full auto and burst: Straight line, extremely consistent right out of the box. If your field allows full auto or burst — this is a beast stock.

Upgrade Path

Three springs in the box means three power levels before you buy a single upgrade. The quick change spring system means you can swap between them in the field in under a minute. AR15 5.56 magazine adapters are available separately.

Shop MDRX accessories and upgrades at Skirmshop USA →

What's Coming Next

MDRX Micron — the compact version. Same platform, shorter package. Stay tuned.

Shop The MDRX 16"

Item	Link
MDRX 16" V3 Black	Shop here
AR15 5.56 Mag Adapter	Shop here
Full Silverback Collection	Shop here

Free shipping on US orders over $200.

FAQ

Does it come assembled?
Yes — the magazine is pre-inserted and the gun is ready to go once you install the charging handle hardware included in the box.

What springs are included?
Three springs — 100N, 80N, and a lighter spring pre-installed. All swappable without tools using the quick change spring system.

What magazines does it take?
The MDRX 16" uses a 7.62x51 size magazine — 140 round mid-cap included. An AR15 5.56 mag adapter is available separately.

What battery does it take?
Battery space is extremely limited. Check the manual for the exact shape that fits. The Titan battery is recommended out of the box.

How does the hop-up adjust?
Proprietary rotary dial under the dust cover at the rear of the gun. 32 positions with audible click per position. Set it before going to the field.

What FPS does it shoot stock?
270 FPS on 0.32g BBs with the pre-installed spring — just over 1 Joule.

Is semi-auto accurate stock?
It needs a break-in period. Run a few magazines through it before your first game. Full auto and burst were extremely consistent right out of the box.

Watch The Full Video

Silverback MDRX 16" — Before You Buy | Unboxing + FPS + Range Test

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Built for the long game. Happy Skirmishing.
— Skirmshop USA