M40A5
Historically Faithful Reproduction of the U.S. Marine Corps M40A5 Sniper Rifle
The B&B Firearms M40A5 recreates the final traditional fiberglass-stock evolution of the legendary United States Marine Corps M40 rifle.
Introduced in 2009, the M40A5 retained the proven Remington 700 short action, Schneider match-grade barrel and McMillan A4 fiberglass stock of the M40A3 while adding several major improvements for modern sniper operations. Most notably, the M40A5 incorporated a detachable magazine system, a suppressor-compatible muzzle system and an embedded forward rail for clip-on night-vision equipment.
Built around original-pattern components and specifications, the B&B M40A5 is intended for collectors and shooters seeking a historically faithful recreation of the M40A5 sniper rifle, not simply a modern Remington 700 with an M40-style appearance.
Built to Order
Estimated Lead Time: 6–8 Weeks
The History of the M40A5
The M40A5 represented the culmination of more than four decades of development of the Marine Corps M40 sniper rifle.
The original M40 entered service during the Vietnam War. It evolved into the fiberglass-stocked M40A1 and later into the substantially modernized M40A3.
By the late 2000s, Marine Corps Scout Snipers were operating in environments that placed new demands on the traditional bolt-action sniper rifle.
The M40A3 remained an exceptionally capable precision weapon, but the Marine Corps wanted greater flexibility in ammunition handling, suppressor use and night-vision capability.
The resulting rifle became the M40A5, officially introduced in 2009.
Rather than replacing the M40A3 with an entirely different rifle, the Marine Corps continued to refine the existing M40 platform.
The M40A5 retained the Remington Model 700 short-action architecture and McMillan A4 fiberglass stock that had become established with the M40A3.
The most significant changes were concentrated around the barrel, magazine system and accessory mounting capability.
A detachable box magazine replaced the traditional hinged-floorplate arrangement. The muzzle was threaded and equipped with a SureFire muzzle brake that also served as the mounting interface for the rifle's SureFire sound suppressor. A forward Embedded Front Rail was added to the McMillan stock for mounting clip-on night-vision equipment ahead of the day optic.
These changes made the M40A5 significantly more adaptable without abandoning the basic M40 design that Marine Corps armorers had refined for decades.
The Marine Corps continued fielding the M40A5 through the 2010s before the M40 system ultimately gave way to newer precision-rifle platforms.
For many shooters and collectors, the M40A5 represents the ultimate evolution of the classic McMillan-stocked M40 sniper rifle.
B&B Firearms M40A5
The B&B Firearms M40A5 is configured to reproduce the defining components and specifications of the original Marine Corps rifle.
At its core is the traditional Remington 700 short action with the heavier M40A3/A5-pattern recoil lug and receiver machining associated with the military rifle.
The barreled action is fitted into an M40A5-spec McMillan A4 fiberglass stock with the correct adjustable saddle cheekpiece, spacer-adjustable length of pull, detachable-magazine inlet and forward night-vision rail configuration.
A Schneider-pattern heavy match barrel, M5 detachable magazine system, 30-MOA optics rail and suppressor-compatible SureFire muzzle system complete the classic M40A5 configuration.
The objective is simple:
To recreate the rifle as an M40A5, rather than merely produce a modern precision rifle inspired by one.
M40A5 Specifications
Action
Remington Model 700 Short Action
The M40A5 continued the Remington 700 short-action architecture used throughout the M40 family.
Marine Corps M40A3 and M40A5 rifles used a heavier .312-inch recoil lug, substantially thicker than the recoil lug associated with earlier M40 and M40A1 rifles. PTG currently identifies this dimension as the M40A3/A5 specification.
Action: Remington Model 700
Action Length: Short Action
Action Type: Bolt Action
Orientation: Right Hand
Bolt Face: Standard .308 / 7.62 NATO
Receiver Pattern: M40A3/A5 specification
Recoil Lug: .312" heavy M40A3/A5 pattern
Magazine System: Detachable Box Magazine
The M40A5 receiver configuration also works in conjunction with the lugged M40A3/A5 30-MOA scope rail. Badger Ordnance describes its USMC M40A3/A5 rail as specifically designed around the Marine Corps clip-slot recoil-lug pattern.
Barrel
Schneider M40A5 Match Barrel
The M40A5 continued the Marine Corps relationship with Schneider Rifle Barrels.
Schneider states that it was the qualified barrel supplier for the Marine Corps M40A3, M40A4, M40A5 and M40A6 series. Its match barrels are stainless steel, button rifled, stress relieved and individually hand lapped.
Manufacturer: Schneider Rifle Barrels
Chambering: .308 Winchester / 7.62×51mm NATO
Material: Match-Grade Stainless Steel
Contour: M40 / #7 Schneider Heavy Profile
Traditional Twist: 1:12" RH
Muzzle: Threaded
Muzzle Device: SureFire MB762SSAL/RE
Suppressor Compatible: Yes
Finish: Subdued Matte Black
Schneider's current contour catalog continues to list a dedicated M40 A1–A6 contour, demonstrating the distinctive heavy profile associated with the M40 family.
Unlike the traditional M40A3, which used a recessed target crown with no suppressor interface, the M40A5 incorporated a threaded muzzle and suppressor-compatible brake.
That change is one of the easiest visual ways to distinguish an M40A5 from an original M40A3.
Muzzle Brake & Suppressor System
SureFire MB762SSAL/RE
One of the defining characteristics of the M40A5 is its SureFire muzzle brake and suppressor mounting system.
SureFire identifies the MB762SSAL/RE specifically as a muzzle brake for the M24/M40 that also serves as the mounting adapter for the FA762SS suppressor.
Manufacturer: SureFire
Model: MB762SSAL/RE
Type: Muzzle Brake / Suppressor Adapter
Caliber: 7.62mm
Suppressor Interface: SureFire FA762SS
SureFire also maintains the MB762SSAL/RE in its current NSN database.
The Marine Corps' own equipment records specifically identify the SureFire FA762SS suppressor for the M40A5.
Historical Suppressor
SureFire FA762SS
The suppressor was designed to attach directly to the rifle's SureFire muzzle-brake adapter.
The suppressor itself is an NFA-regulated item and may be offered separately where legally available.
Stock
McMillan A4 — M40A5 Specification
The M40A5 retained the distinctive McMillan A4 fiberglass stock, but with an inlet and accessory configuration specific to the A5.
McMillan continues to manufacture an M40A5-spec A4 stock and states that it uses the same specifications associated with the Marine Corps M40A5 sniper rifle.
Manufacturer: McMillan
Model: A4 / M40A5 Specification
Construction: Fiberglass
Fill: Sniper Fill
Color: Molded-In Olive Green
Action Inlet: Remington 700 Short Action
Recoil Lug Inlet: .312"
Barrel Inlet: #7 Schneider / M40 Profile
Cheekpiece: Gen 1 Adjustable Saddle
Cheek Adjustment: Dual Knob
Length of Pull: Spacer Adjustable
LOP Range: Approximately 13"–14.5"
Recoil Pad: 1/2" Presentation Pad
Front Sling Stud: 1
Flush-Cup QD Mounts: 6
Left Side: 2
Right Side: 2
Bottom: 2
Bottom-Metal Inlet: M5 Detachable Magazine
Forward Rail Inlet: M40A5 EFR
Approximate Stock Weight: 4.75 lb.
The Olive Green color is molded into the fiberglass rather than simply applied as exterior paint, maintaining the characteristic appearance of the Marine Corps stock.
Detachable Magazine System
Badger Ordnance M5 DBM
The detachable magazine is one of the most important differences between the M40A5 and earlier M40 rifles.
The Badger Ordnance M5 detachable-magazine trigger guard was developed for Remington 700-pattern short actions and allows rapid loading and unloading through detachable box magazines.
Manufacturer: Badger Ordnance
Model: M5
Configuration: Detachable Box Magazine
Action Pattern: Remington 700 Short Action
Material: Aircraft-Grade Aluminum
Finish: Mil-Spec Type III Hard Anodized
Standard Magazine: 5-Round Detachable Magazine
The M5 system represented a significant operational improvement over the internal five-round magazine and hinged floorplate used by the original M40A3.
PTG also currently produces an M40A5-style M5 system capable of accepting AICS-pattern 5- and 10-round magazines.
Forward Night-Vision Rail
M40A5 Embedded Front Rail — EFR
The Embedded Front Rail, commonly referred to as the EFR, is another defining M40A5 feature.
The rail is installed into the fore-end of the McMillan stock ahead of the primary day optic.
Its purpose is to provide a rigid mounting location for inline clip-on night-vision or thermal equipment without requiring the sniper to remove or re-zero the primary riflescope.
McMillan specifically identifies the M40A5 stock as being inlet for a PGW or SOL Strategic-style EFR.
PTG currently offers an M40A5 UNS EFR with a 3-inch upper Picatinny rail and an integral side accessory rail.
Type: Embedded Front Rail
Location: Stock Fore-End
Interface: Picatinny
Purpose: Clip-On Night Vision / Thermal Optics
Historical Application: Inline night-vision equipment ahead of day optic
This front rail gives the M40A5 a noticeably more modern appearance than the M40A3.
Scope Base
USMC M40A3/A5 30-MOA Scope Rail
The M40A5 uses the same general lugged 30-MOA optics-rail architecture developed for the M40A3.
Badger Ordnance currently identifies its short-action rail as being manufactured specifically for the USMC M40A3/A5 Scout Sniper Rifles.
Application: Remington 700 Short Action
Pattern: USMC M40A3/A5
Elevation: 30 MOA
Interface: MIL-STD-1913 Picatinny
Construction: One Piece
Receiver Interface: M40 Clip-Slot / Recoil-Lug Pattern
PTG likewise currently manufactures an M40A3/A5 30-MOA rail to the USMC print, with an integral recoil lug and MIL-STD-1913 dimensions.
Optic: (not included)
Schmidt & Bender M8541 Scout Sniper Day Scope
The classic M40A5 is closely associated with the Schmidt & Bender 3–12×50 PM II family used as the Marine Corps Scout Sniper Day Scope.
Manufacturer: Schmidt & Bender
Series: PM II
Magnification: 3–12×
Objective Diameter: 50mm
Tube Diameter: 34mm
Role: Scout Sniper Day Scope
Marine Corps training material identifies the M40A5 as a 7.62mm sniper rifle equipped with a 3–12×50 optic.
Schmidt & Bender states that its 3–12×50 PM II successfully completed the Marine Corps' intensive two-year quality and endurance testing program.
Scope Rings: (Not included)
Badger Ordnance USMC 34mm Rings
The Schmidt & Bender optic was paired with heavy-duty Badger Ordnance military-pattern rings.
Manufacturer: Badger Ordnance
Diameter: 34mm
Material: Ordnance-Grade Steel
Configuration: Serialized Matched Pair
Finish: Black
Badger Ordnance continues to manufacture USMC-pattern scope rings and identifies its Marine Corps rings as part of the M40 sniper rifle system.
Trigger
Remington Precision Trigger
The M40A5 retained the traditional Remington-pattern single-stage trigger system associated with the M40 family.
Pattern: Remington
Type: Single Stage
Safety: Receiver-Mounted Remington Pattern
Configuration: Precision Adjusted
Rather than replacing the basic Remington fire-control architecture, the M40A5 continued to refine the proven system already used through previous generations of the M40 rifle.
Bipod
Harris Swivel Bipod
The M40A5 was commonly fielded with a Harris-style swivel bipod attached to the single front stud of the McMillan A4 stock.
Manufacturer: Harris
Type: Swivel Bipod
Typical Height: Approximately 6"–9"
Attachment: Front Sling Stud
Legs: Adjustable / Folding
The bipod and its mounting stud are part of the characteristic field configuration of the M40A5.
General Specifications
Model: M40A5
Platform: M40 Rifle
Weapon Type: Bolt-Action Precision Rifle
Action: Remington Model 700 Short Action
Action Orientation: Right Hand
Caliber: .308 Winchester / 7.62×51mm NATO
Recoil Lug: .312" M40A3/A5 Pattern
Barrel Manufacturer: Schneider Rifle Barrels
Barrel Material: Stainless Steel
Barrel Contour: M40 / #7 Schneider Heavy Profile
Traditional Twist: 1:12" RH
Stock: McMillan A4 M40A5 Specification
Stock Material: Fiberglass
Stock Color: Molded-In Olive Green
Stock Fill: Sniper Fill
Cheekpiece: Gen 1 Adjustable Saddle
Length of Pull: Spacer Adjustable, Approximately 13"–14.5"
Bottom Metal: Badger Ordnance M5
Magazine Type: Detachable Box Magazine
Standard Capacity: 5 Rounds
Scope Rail: USMC M40A3/A5 30-MOA Rail
Forward Accessory Rail: M40A5 EFR
Muzzle Brake: SureFire MB762SSAL/RE
Suppressor: SureFire FA762SS Historical Configuration
Primary Day Optic: Schmidt & Bender 3–12×50 PM II / M8541 Configuration
Scope Ring Diameter: 34mm
Historical Maximum Effective Range: Approximately 1,000 meters
Build Type: Made to Order
Estimated Lead Time: 6–8 Weeks
M40A3 vs. M40A5
Although the M40A5 retained much of the appearance and architecture of the M40A3, several changes make the rifles easy to distinguish.
M40A3
Remington 700 Short Action
Schneider Heavy Match Barrel
McMillan A4 Stock
Traditional Crowned Muzzle
No Standard Suppressor Interface
Original Internal Magazine / Hinged Floorplate Configuration
No Standard M40A5 Forward Night-Vision Rail
M40A5
Remington 700 Short Action
Schneider Heavy Match Barrel
McMillan A4 M40A5 Stock
Threaded Muzzle
SureFire Muzzle Brake / Suppressor Adapter
SureFire Suppressor Compatibility
Badger M5 Detachable Magazine System
M40A5 Embedded Front Rail for Night Vision
The changes may appear relatively small compared with the transition from the M40A1 to the M40A3, but they fundamentally changed how adaptable the rifle was in the field.
From the M40A1 to the M40A5
The development of the M40A5 can be understood as a continuous evolution of the same basic Marine Corps sniper-rifle philosophy.
M40A1
McMillan fiberglass stock
Heavy match barrel
Fixed stock geometry
Internal magazine
Fixed-power optic
M40A3
McMillan A4 adjustable stock
Schneider heavy match barrel
Adjustable cheekpiece
Spacer-adjustable length of pull
Modern optics rail
M40A5
McMillan A4 M40A5 stock
Schneider heavy match barrel
Detachable magazine
Suppressor-compatible muzzle
SureFire sound suppressor system
Forward night-vision mounting rail
Variable-power Schmidt & Bender optic
The M40A5 therefore represents the most developed form of the traditional fiberglass-stocked M40 rifle before the Marine Corps moved to the modular chassis configuration associated with the M40A6.
Built to Order
Every B&B Firearms M40A5 is built to order.
A historically faithful M40A5 requires significantly more than simply placing a Remington-pattern action into a green tactical stock.
The action configuration, heavy recoil lug, Schneider barrel profile, McMillan A4 stock, M5 detachable-magazine system, M40A3/A5 optics rail, Embedded Front Rail and SureFire muzzle system are all defining characteristics of the rifle.
The B&B Firearms M40A5 is configured around those details to recreate the character and appearance of the Marine Corps weapon system.
Estimated Lead Time: 6–8 Weeks
Lead times are estimates and may vary based on component and optic availability.
Why the M40A5?
The M40A5 represents the final stage of the traditional Marine Corps M40 before the rifle moved into a modular chassis.
It retained the familiar Remington 700 action and McMillan fiberglass stock that had defined generations of Marine sniper rifles while incorporating the equipment needed for modern operations.
The detachable magazine improved ammunition handling.
The SureFire muzzle system allowed suppressed operation.
The forward EFR allowed the use of inline night-vision equipment.
And the Schmidt & Bender variable-power optic provided substantially more flexibility than the fixed-power scopes associated with earlier M40 rifles.
For collectors, the M40A5 sniper rifle represents the culmination of the classic M40 design.
For shooters, it combines traditional bolt-action simplicity with many of the capabilities expected from a modern precision rifle.
And for anyone assembling a collection of M40 rifles, the M40A5 is the final step before the radically different M40A6 chassis system.
Historical Reproduction Notice
The B&B Firearms M40A5 is a newly manufactured, historically faithful reproduction based upon the configuration and specifications of the United States Marine Corps M40A5 sniper rifle.
It is not represented as a U.S. Government-issued or surplus firearm and is not manufactured by, endorsed by or affiliated with the United States Marine Corps or Department of Defense.
