51Fifty EM4 Rifle: Built for the Toughest Missions

The 51Fifty EM4 rifle is purpose-built to meet the rigorous demands of Law Enforcement, Military, and Government Agencies. Whether you’re part of a SWAT team, Special Forces, a Patrol Officer, Infantry, Security Specialist, or Government Operator, this rifle is engineered to dominate, adapt, and prevail in any environment.

The EM4 features a reengineered magwell, shortened by 1 inch, with a large flare and deep chamfers for quick and smooth magazine changes, even under pressure. With the option of semi-auto, full-auto, or tri-burst fire controls, and an ambidextrous safety, it offers flexibility for diverse tactical situations. The patent-pending Rapid Action Cam (R.A.C.) system ensures tighter tolerances, sub-MOA accuracy, and significantly reduces recoil and muzzle rise. With amphibious capabilities, it thrives in any environment.

Equipped with the Tactical Advantage ARCA-15 handguard, the EM4 offers an integral 45-degree red-dot mounting option, five rows of M-LOK for maximum customization, and QD cups for added versatility. Designed to provide superior reliability, precision, and performance, this full-length rifle is built to withstand the harshest conditions while delivering uncompromising firepower.

When the mission is critical, trust in the rifle that never settles—51Fifty.

EM4 SPECS

LOWER RECEIVER MATERIAL:

7075 BILLET ALUMINUM

UPPER RECEIVER MATERIAL:

7075 BILLET ALUMINUM

receiver attachment:

rapid action cam(r.a.c.) - patent pending

HANDGUARD MATERIAL:

6061 BILLET ALUMINUM

HANDGUARD:

TACTICAL ADVANTAGE ARCA-15

EJECTION:

LEFT OR RIGHT

MUZZLE DEVICE:

SINGLE OR DUAL PORT BREEK LOK SUPPRESSOR QD BRAKE

BARREL length:

14.5", 16"

calibers:

.223 WYLDE, 300blk

BARREL feed ramp:

single "fat" feed ramp

fire control:

semi auto, full auto, tri-burst

gas system:

direct impingement

charging handle:

ambidextrous gas blocking suppressor optimized

buffer system:

standard or amphibious buffer

bolt carrier group:

8620 steel nitride coated full auto rated bcg

grip & stock:

amend2 pistol grip & ams modular stock

COLORS:

BLACK, GREY, FDE, OD GREEN

accuracy:

sub-moa

business Hours

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