Bushmaster Modular Accessories System




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B.M.A.S. 3-Rail Gas Block only
The B.M.A.S. 3-Rail Gas Block can be ordered on new barrels as a factory installed option, or we can factory retrofit existing sight bases on .750" diameter barrels. It's three rails are in standard Picatinny configuration to allow addition of flashlight or laser as side mounted accessories. The B.M.A.S. Three Rail Block is precision milled from alloy steel; finished in black manganese phosphate; and drilled and tapped on the bottom for the addition of a sling swivel stud (Note: this stud is not intended as a bipod mount).
Price: $60.77
Part No: F1002419
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B.M.A.S. Flip Sight Sling Swivel Stud
Threaded 3/8 x 24 to fit the B.M.A.S. V Match Front Flip Sight above - accepts any quick detach type sling swivel like our KNS-4.
Price: $6.18
Part No: F1002418
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B.M.A.S. Folding Front Sight/Gas Block
This Gas Block/folding Front Sight Combination is all steel construction, easily actuated with the push of a button, and locks in the deployed position. It includes a standard AR front sight post, detent and detent spring, and is the same weight as a standard AR sight tower. The sight's split design allows it to be mounted onto barrels that already have pinned or welded muzzle brakes or suppressors. It attaches easily with 4 cap screws (use of Loctite is recommended), and includes a Bayonet Lug and Sling Loop. All pieces are Manganese Phosphate finished for protection against corrosion. Shown flipped up in the foreground and folded in the shadowed image. This unit fits all standard AR-15 type barrels with a .750" diameter at Gas Port.
Price: $100.94
Part No: F1002426
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B.M.A.S. Four-Rail Free-Floater Handguard for Rifles
The four Picatinny rails machined into these free floater forends offer unlimited mounting options for sights, scopes, grips, lights, lasers, etc. Venting slots all around aid in barrel cooling, and rail front edges are drilled and machined to accept the B.M.A.S. Swivel Sling Stud (Note: That stud would not function as a bipod mounting point). These forends are machined from aircraft quality aluminum and hardcoat anodized to mil. specs. The rifle model fits 20" and longer barrels; the carbine version is designed for 16" barrels. Assemblies include forearm, barrel nut and jam nut.

Note: Barrel/Front Sight disassembly is required for installation.

Options: For Rifles or Carbines
Price: $181.28
Part No: F1002447
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B.M.A.S. Low Profile Rear Flip Sight
Bushmaster's flip-up rear sight for AR15 type Flattop Receivers features a steel base, a quick release thumb screw, and an aluminum stem. This sight locks up (deployed position) with the push of a button, and folds down to .840 inches above the upper receiver. Windage adjustment is 1/2 M.o.A., and a standard dual aperture rear peep is fitted. Mounts to any Picatinny rail and will "co-witness" with standard AR15, M16 and M4 type front sights. Once sighted-in on your rifle, it can be removed and reattached with no loss of "zero" - also fits behind the A.R.M.S. S.I.R. System forends.
Price: $97.85
Part No: F1002472
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B.M.A.S. Rail Extension
Available in 4" - 7" - 11.25" Lengths... These precision machined Rail Extensions - in standard Picatinny rail dimensions - mount on all AR15/M16 flat-top Upper Receivers to elevate the scope/optic mounting surface approx. 1/2''. The two longer lengths can join and solidify the Upper Receiver to any Four Rail Forend offering the extra mounting surface length necessary for very large/long scopes or "scout-style" mounting. 11.25". Anodize finished machined aluminum.

Options: 4" Extension, 7" Extension or 11.25" Extension
Price: $43.26
Part No: F1002464
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B.M.A.S. Solid Vertical Forearm Grip
Slides onto Picatinny rail forends and tightens with few twists to add stability and control of muzzle rise in rapid fire.
Price: $40.17
Part No: F1002428
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B.M.A.S. Split Four-Rail Handguard for Carbines
The "split" design of this handguard set allows easy installation of an accessory rail system on any AR type Rifle. Light weight and beautifully machined of aircraft aluminum, they snap in place of your standard carbine or rifle handguards, and offer full length Picatinny configuration rails for attachment of the flashlight/laser sight accessories of your choice. The rails are positioned at 12 - 3 - 6 - 9 o'clock, and the top handguard can be used in conjunction with an M203 Grenade Launcher. Thoroughly vented to keep your barrel cool, they are finished in mil. spec. matte black anodize to eliminate glare and protect against corrosion.

Note: These will not fit the DCM rifle or .308

Options: Rifle Length or Carbine Length
Price: $203.94
Part No: F1002471
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B.M.A.S. SuperLight Barrel Bushings
This set of steel bushings fit the thinner Bushmaster SuperLight Barrels - order in addition to Triple Mount Kit above.
Price: $15.45
Part No: F1002411
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B.M.A.S. Triple Mount Rail Kit
A quality multi-purpose accessory mount that clamps to the barrel of your AR rifle and fits around the front sight with three separate rail surfaces to allow mounting flashlights, bipod, laser sights, etc. Designed to fit both Post & Pre-Ban barrels (with bayonet lug), there are inserts included with this kit that allow fitting to either .720" diam. (20"/24") or .740" diam. (14.5"/16") barrels. This triple mount will accept all Picatinny/Weaver base attachments, and is machined from solid, black anodized, aircraft aluminum with Allen head clamping screws.
Price: $90.64
Part No: F1002410
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B.M.A.S. Clamp-on Rear Flip-Up Sight
An aircraft grade aluminum, flip-up auxiliary sight featuring dual apertures, 1/2 M.o.A. windage adjustment, black anodized finish, convenient right hand adjustment knob and full height sight apertures. Height when folded is 1/8" lower than similar designs.
Price: $85.49
Part No: F1002433
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B.M.A.S. Detachable Front Flip-up Sight
The B.M.A.S. Detachable Front Flip Sight (patent pending) is designed to clamp snugly on the gas block's top Picatinny rail with a pair of socket head screws for repeat zero every time. Machined from aircraft aluminum billet, it locks up or flips down at the touch of a button. A standard A2 front sight post with spring and detent locking system offers elevation zeroing just as with the original M16A2 sight system.

Options: Sight Only, 3-Rail Gas Block or Sight and Gas Block Set
Price: $82.40
Part No: F1002425
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B.M.A.S. Fixed Clamp-on Front Sight
A standard height, fixed style front sight, this unit adds the convenience of a quick detach knurled thumbnut and clamping bar for easy removal. Returns to zero upon reattachment and includes standard AR Front Sight Post and Detent System - adjustable for elevation.
Price: $54.59
Part No: F1002455
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B.M.A.S. Front Flip-up Sight/Three-Rail Gas Block SET
The B.M.A.S. Detachable Front Flip Sight (patent pending) is designed to clamp snugly on the gas block's top Picatinny rail with a pair of socket head screws for repeat zero every time. Machined from aircraft aluminum billet, it locks up or flips down at the touch of a button. A standard A2 front sight post with spring and detent locking system offers elevation zeroing just as with the original M16A2 sight system. The B.M.A.S. Three Rail Block is precision milled from alloy steel; finished in black manganese phosphate; and drilled and tapped on the bottom for the addition of a sling swivel stud (Note: this stud is not intended as a bipod mount).
Price: $135.96
Part No: F1002423
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B.M.A.S. Handguard Mounted Flip-up Sight
The Bushmaster Modular Accessories System solution to a handguard mounted back-up iron sight is this low profile, front flip-up unit. It attaches to any forend Picatinny rail, and folds down out of line of sight at the push of a button. It locks up in a deployed position, and mounts easily with a large knurled thumbscrew. Low profile, durable and lightweight all steel construction - manganese phosphate finished - includes AR square post, detent and spring - elevation adjustable.
Price: $81.37
Part No: F1002466
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B.M.A.S. Low Profile Clamp-on Front Sight
A low profile design Front Sight of quality alloy steel that folds flat at the touch of its side button to allow clearance for any large bell scope you might choose to mount. It flips up to lock in the deployed position with zero repeatibility, and includes a standard, AR Front Sight Post and Detent System. Black phosphate finished - made in USA.
Price: $84.46
Part No: F1002461
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B.M.A.S. Rail Extension
Available in 4" - 7" - 11.25" Lengths... These precision machined Rail Extensions - in standard Picatinny rail dimensions - mount on all AR15/M16 flat-top Upper Receivers to elevate the scope/optic mounting surface approx. 1/2''. The two longer lengths can join and solidify the Upper Receiver to any Four Rail Forend offering the extra mounting surface length necessary for very large/long scopes or "scout-style" mounting. 11.25". Anodize finished machined aluminum.

Options: 4" Extension, 7" Extension or 11.25" Extension
Price: $39.95
Part No: YHM-9595
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B.M.A.S. Rail for Rifle Handguard
Add accessories to any standard Rifle or Carbine handguard with these Anodized Aluminum Rails. Mounting requires removal of the handguards and inner shields - Rails fasten through the existing vent holes, and are tapered so that accessories mount on same plane as barrel and bore. Vent holes are aligned with existing handguard vents for proper barrel cooling. The Car Length Rail will fit on a Rifle length handguard if desired. Handguards have the possibility of movement, so we do not recommend installation of optics or lasers on these rails.

Handguards not included.

Price: $64.89
Part No: F1002478
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B.M.A.S. Scope Risers: 1 1/4" Length
Increase scope mounting height on flat-top style ARs by 1/2 inch to achieve proper cheek weld (two Risers are required - one for each scope ring). Hard anodized aircraft aluminum, they fit all Picatinny/Weaver base dovetails.

Options: 1 1/4" Scope Riser or 3/4" Scope Riser
Price: $17.51
Part No: F1002397
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Bennie Cooley Co-Witnessing Adjustable Mount
This sight mounting platform for the AR15/M16 is hailed as the most versatile co-witnessing mounting system made. It is vertically adjustable for easy alignment and custom fitting of any red dot optic (EOTech Holosight, Trijicon Reflex, Aimpoint Comp or others) in relation to the iron sights of the rifle or carbine. It mounts into the A2 Carry Handle with a large hex-head nut/threaded post, and height adjustments are made to the Picatinny front rail with 8/32 button head retaining screws and the supplied 3/32 Allen wrench.
Price: $175.10
Part No: F1001214
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PLEASE NOTE: A Federal Firearms License is REQUIRED for the purchase of any Complete Weapon or Lower Receiver. Your order will not be processed without it. See the Dealer Locator for your nearest Bushmaster Dealer. Any other firearms parts or accessories shown in this website may be purchased directly.