Century Arms BFT556 Core 5.56×45 16.5-Inch Rifle

The Century Arms BFT556 Core is a semi-automatic AK-pattern rifle chambered in 5.56x45mm NATO.

Built as part of Century Arms’ BFT family, the rifle combines several AK-derived characteristics with a reinforced receiver and modern production features.

In addition, this configuration features a forged bulged front trunnion, 1.5mm stamped-steel receiver and traditional-style furniture. Together, these details give the BFT556 its distinctive appearance within Century Arms’ U.S.-made AK lineup.

Century Arms BFT556 Core Overview

The Century Arms BFT556 Core expands the BFT platform into the 5.56x45mm chambering.

At the center of the design is a 1.5mm stamped-steel receiver combined with a forged and bulged front trunnion.

Furthermore, the rifle incorporates several details associated with an AK-74-style configuration, including its gas-block and muzzle-device arrangement.

As a result, the BFT556 differs visually and mechanically in several respects from Century’s 7.62×39 BFT47 configuration.

BFT556 5.56x45mm Chambering

The BFT556 is chambered in 5.56x45mm NATO.

This chambering distinguishes it from the original BFT47, which uses 7.62x39mm.

Additionally, the model designation reflects the caliber family, making BFT556 an important identifying term when comparing different Century BFT variants.

For identification purposes, the chambering should also be confirmed through the markings on the individual rifle.

BFT556 16.5-Inch Barrel Configuration

The supplied product configuration identifies the rifle with a 16.5-inch barrel.

Century specifies chrome-moly 4150 steel for the BFT556 barrel, together with a chrome-lined chamber and bore.

Therefore, barrel construction represents one of the major technical specifications associated with this platform.

Some distributor databases describe the same RI5042-N model with slightly different barrel-length rounding. For that reason, the individual product label and manufacturer documentation should be checked when an exact measurement is required.

BFT556 Reinforced Receiver Construction

A major characteristic of the BFT platform is its 1.5mm stamped-steel receiver.

Unlike the thinner receiver construction associated with many standard AK-pattern rifles, the BFT design uses the heavier receiver together with a bulged front-trunnion arrangement.

Furthermore, Century Arms specifies a forged and bulged 4140 steel front trunnion.

Together, these components provide some of the clearest structural clues for identifying a BFT-series receiver.

Forged Bulged Front Trunnion

The bulged front trunnion forms an important part of the BFT556 design.

Century manufactures this component from forged 4140 steel.

Meanwhile, the bulged profile around the front of the receiver gives the rifle a noticeably different appearance from conventional AKM-style receiver construction.

Consequently, the trunnion is both a technical specification and an identifying characteristic of the BFT platform.

Barrel and Metal Finish

Century Arms specifies a chrome-lined chrome-moly 4150 steel barrel for the BFT556.

In addition, major metal components use a manganese-phosphate finish.

Century identifies this finish as meeting MIL-DTL-16232 specifications.

Therefore, the finish represents another useful detail when documenting the factory configuration of the rifle.

AK-74-Influenced Details

The BFT556 incorporates several visual characteristics associated with the AK-74 family.

For example, the platform uses a 90-degree gas block and an AK-74-style muzzle-brake arrangement.

Additionally, published specifications identify a 14x1mm left-hand thread pattern for the muzzle configuration.

These characteristics help distinguish the BFT556 from Century’s earlier BFT47 configuration.

Furniture Configuration

The BFT556 Core is associated with traditional-style wood furniture and a contrasting polymer pistol grip.

Current RI5042-N listings commonly identify the stock and handguard appearance as Russian Red Maple.

Meanwhile, Century Arms specifies a US Palm polymer grip.

Because furniture colors and production packages can change, however, photographs and SKU information provide the best confirmation for a particular example.

Adjustable Sight System

The BFT556 includes an adjustable iron-sight arrangement.

Century lists both the front and rear sights as adjustable.

Furthermore, the receiver incorporates an optics-ready side mount.

These features form part of the factory configuration and can also help distinguish this version from rifles using substantially different receiver or sight arrangements.

RAK-1 Enhanced Trigger

Century equips the BFT556 with its RAK-1 Enhanced Trigger.

This trigger forms part of the BFT-series fire-control configuration.

Additionally, published BFT specifications describe the RAK-1 as a double-hook trigger system.

As with other factory components, however, the individual rifle should be inspected when documenting a previously owned or modified example.

Extended Controls

The BFT platform incorporates several revised external controls.

For example, the rifle uses an extended magazine-release arrangement.

In addition, the safety lever includes a bolt-hold-open notch on the BFT platform.

Together, these controls represent some of the smaller but recognizable differences between the BFT and more basic AK-pattern configurations.

BFT556 Key Specifications

• Manufacturer: Century Arms
• Model: BFT556 Core
• Series: BFT556
• SKU / MPN: RI5042-N
• UPC: 787450894044
• Platform: AK-pattern
• Action: Semi-automatic
• Caliber: 5.56x45mm NATO
• Listing barrel length: 16.5 inches
• Barrel material: Chrome-moly 4150 steel
• Bore/chamber: Chrome lined
• Receiver: Stamped steel
• Receiver thickness: 1.5mm
• Front trunnion: Forged and bulged
• Front-trunnion material: 4140 steel
• Metal finish: Manganese phosphate
• Finish specification: MIL-DTL-16232
• Grip: US Palm polymer
• Furniture style: Russian Red-style wood configuration
• Front sight: Adjustable
• Rear sight: Adjustable
• Optics interface: Receiver side mount
• Trigger: RAK-1 Enhanced Trigger
• Gas-block style: 90-degree
• Muzzle-device style: AK-74 influenced
• Thread pattern: 14x1mm LH
• Magazine capacity referenced by manufacturer: 30 rounds

BFT-Series Receiver Design

The BFT receiver architecture represents one of the defining aspects of this rifle family.

First, Century uses a thicker 1.5mm stamped receiver. Next, the forged bulged trunnion reinforces the characteristic front section.

Furthermore, this construction gives the BFT series a receiver profile that resembles heavier AK-derived designs rather than a conventional AKM receiver.

For identification purposes, these characteristics provide useful distinctions between the BFT556 and other Century Arms AK-pattern models.

Century Arms BFT556 Platform Background

Century Arms introduced the BFT556 as an expansion of its American-made BFT rifle family.

The original BFT platform appeared in 7.62x39mm, while later variants expanded the series into additional chamberings.

Consequently, the BFT556 retains the reinforced construction principles of the series while adopting the 5.56x45mm cartridge and several AK-74-influenced external characteristics.

For official manufacturer documentation and technical reference material, see the Century Arms Manuals.

Century Arms also maintains documentation covering its BFT family, including BFT-series warranty information.

Identification Notes

Several characteristics can help identify the Century Arms BFT556 Core.

First, check the model and caliber markings for BFT556 and 5.56x45mm information.

Next, examine the receiver. The 1.5mm stamped construction and bulged forged trunnion provide strong visual indicators of the BFT platform.

Furthermore, the 90-degree gas block, AK-74-style muzzle arrangement, side optics rail and distinctive wood furniture provide additional clues.

Finally, compare the SKU or UPC when identifying the exact commercial configuration. For the configuration discussed here, the commonly documented manufacturer part number is RI5042-N.

Century Arms BFT556 Technical Summary

In summary, the Century Arms BFT556 Core combines the BFT-series reinforced AK-pattern receiver with a 5.56x45mm chambering.

Its key construction characteristics include a 1.5mm stamped-steel receiver, forged bulged 4140 front trunnion and chrome-lined 4150 chrome-moly barrel.

Additionally, the rifle incorporates adjustable sights, a receiver-side optics mount, RAK-1 trigger and AK-74-influenced external details.

Taken together, these characteristics provide a concise technical picture of the BFT556 Core configuration.