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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG) Up to 26% Off w/ Free Shipping — 5 models
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TRYBE Defense Complete Bolt Carrier Groups
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Gold Chrome, BCG556-LMGLD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Rainbow PVD, BCG556-LMPVD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Nickel Boron, BCG556-LMNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, High-Polished Nickel Boron, BCG556-LMHPNB
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group BCG, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Gold Chrome, BCG556-LMGLD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Gold Chrome, BCG556-LMGLD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Gold Chrome, BCG556-LMGLD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Gold Chrome, BCG556-LMGLD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Gold Chrome, BCG556-LMGLD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Rainbow PVD, BCG556-LMPVD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Rainbow PVD, BCG556-LMPVD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Rainbow PVD, BCG556-LMPVD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Rainbow PVD, BCG556-LMPVD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Rainbow PVD, BCG556-LMPVD
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Nickel Boron, BCG556-LMNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Nickel Boron, BCG556-LMNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Nickel Boron, BCG556-LMNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Nickel Boron, BCG556-LMNB
25 of 34 images
TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Nickel Boron, BCG556-LMNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, High-Polished Nickel Boron, BCG556-LMHPNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, High-Polished Nickel Boron, BCG556-LMHPNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, High-Polished Nickel Boron, BCG556-LMHPNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, High-Polished Nickel Boron, BCG556-LMHPNB
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TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, High-Polished Nickel Boron, BCG556-LMHPNB
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group, Black Nitride, BCG556-LM
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Questions & Answers
Customer Reviews
Helpful Positive Review
I got a delton dissipator and those builds are notorious for weaker gas, but very pleasant recoil. I got this BCG as it is about 30% less weight than a regular milspec bcg. It solved any short stroking issues I had and my dissipator cycles reliably e...
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6/6 found this helpful
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Helpful Positive Review
I am very happy with this BCG. So light and a really unique design. I put 500 rounds through it last weekend and it performed without any issues. Easy install. Well built and bolts properly staked. Really just a great lightweight BCG if you want to s...
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9/9 found this helpful
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Helpful Positive Review
Used it in a "lightweight" build and man it works. Barrel and bolt are the heart of any rifle. With this BCG you can know the bolt part is good. 1500 rounds on it so far. Cleaning ever 500 or so and no malfunctions. Finish still looks new
7/7 found this helpful
Helpful Positive Review
I bought this BCG to complete my Wilson Combat AR Pistol build. It is a nice edition and it runs well!
1/1 found this helpful
Helpful Negative Review
Even for the price this BCG is trash. Arrived partially disassembled and the parts don't fit together.
1/6 found this helpful
Most Recent Reviews
Good value lightweight bolt. Used in a 300blk build with good success even with dirty subs and heavy lube. Sand cuts seem to be solid. Need more rounds to test durability. Part of cam pin channel was chipped but did not affect reliability so far... N...
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5/5 found this helpful
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Product Info for TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG)
Low-Mass. High-Precision. Tuned for Gas Optimization.
Drop ounces, not performance. The TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group is a precision-engineered BCG optimized for reduced reciprocating mass, faster cyclic rates, and improved recoil management in tuned AR-15 platforms. Built for shooters who demand faster cycling, reduced recoil impulse, and uncompromising durability under high round counts and harsh conditions.
The bolt carrier is CNC-machined from AISI 8620 steel, selected for its core hardness, tensile strength, and fatigue resistance. The reduced-mass geometry includes lightening cuts and skeletonization to bring the carrier weight to approximately 8.8 ounces — a 25–30% weight reduction from standard M16-profile carriers.
The bolt is constructed from AISI 9310 steel, offering enhanced toughness and superior fatigue resistance compared to traditional Carpenter 158. Each bolt undergoes shot peening, magnetic particle inspection (MPI), and high-pressure testing (HPT) to ensure structural integrity under high round counts and adverse firing conditions.
Each unit is QPQ nitride treated for extreme surface hardness, corrosion resistance, and smooth, low-friction operation — even in suppressed setups. Available in your choice of high-performance finishes — including Black Nitride, Nickel Boron, Gold Titanium Nitride, and PVD — each variant offers a distinct balance of lubricity, corrosion resistance, and eye-catching appeal.
This lightweight BCG is optimized for use with adjustable gas blocks, tuned buffer weights, and reduced-power recoil springs, enabling shooters to fine-tune cyclic energy and bolt velocity. Ideal for flat-shooting competition rifles, suppressed builds, or any system requiring precise control over gas and inertia forces. Whether you're dialing in a race gun or fine-tuning a lightweight duty rifle, the TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group is engineered for anyone demanding faster cycling and less recoil impulse.
If you like what you see, click on the links below to view a wide variety of our best-in-class offerings from TRYBE Defense, TRYBE Optics, and TRYBE Tactical. TRYBE has hard-core offerings ready to augment your favorite firearm or next custom build that offer superb performance, keeping in mind your hard-earned dollar.
TRYBE Defense Gun Parts and Accessories, Gunsmithing Equipment, Personal Protective Equipment, Pistol Parts, Rifle Parts, and Triggers
TRYBE Optics Binoculars, Night Vision, Rangefinders, Red Dot Sights, Riflescopes, and Weapon-Mounted Accessories
TRYBE Tactical Apparel, Eyewear, Gun Cases, Hearing Protection, Holsters, Magazine Pouches, Plate Carriers, and Range Bags
Specifications for TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG):
| Manufacturer: | TRYBE Defense |
| Fabric/Material: | AISI 8620 Steel |
| Caliber: | 5.56x45mm NATO, .300 AAC Blackout, .223 Remington |
| Gun Make: | AR Platform |
| Gun Model: | M16, M4, AR-15 |
Features of TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG):
- Carrier: AISI 8620 Steel, Low-Mass Profile, Skeletonized Cuts, Forward Assist Compatible
- Bolt: AISI 9310 Steel, Shot-Peened, MPI & HPT Certified
- Gas Key: Chrome-Lined, Properly Staked per MIL-SPEC Requirements, Hardened Steel
- Firing Pin: Standard Profile, Enhanced Surface Treatment
- Made in the USA
- Finish Options
- Black Nitride (QPQ) – Corrosion-Resistant, Surface-Hardened, Matte Black
- Nickel Boron (NiB) – Electroless-Coated, Self-Lubricating, Low-Friction, Matte Silver Appearance
- High-Polished Nickel Boron (NiB) – Electroless-Coated, Self-Lubricating, Low-Friction, High Polished Silver Appearance
- Gold Titanium Nitride (TiN) – Ultra-Hard, Optimized for Wear Surfaces, Matte Gold Appearance
- Rainbow PVD (Physical Vapor Deposition) – Advanced Vapor-Phase Coating for Superior Wear & Heat Resistance
Package Contents:
- TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG)
TRYBE Warranty
TRYBE™ products are made for performance and durability and are covered by a limited lifetime warranty. See Full Warranty Information here
What firearm models does the manufacturer say TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG) is compatible with?
The manufacturer suggests that TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG) is compatible with AR-15, M4, M16TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG) Orderable Models
List of Orderable Models
- TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Gold Chrome, BCG556-LMGLD , UPC: 810089415134 , Code: TRB-BCG-AC1-BCG556-LMGLD
- TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Rainbow PVD, BCG556-LMPVD , UPC: 810089415165 , Code: TRB-BCG-AC1-BCG556-LMPVD
- TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, Matte Nickel Boron, BCG556-LMNB , UPC: 810089415172 , Code: TRB-BCG-AC1-BCG556-LMNB
- TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group BCG, Black Nitride, BCG556-LM , MPN: BCG556-LM , UPC: 810089411938 , Code: TRB-BCG-AC1-BCG556-LM
- TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group, High-Polished Nickel Boron, BCG556-LMHPNB , UPC: 810089415189 , Code: TRB-BCG-AC1-BCG556-LMHPNB
TRYBE Defense Low-Mass AR-15 Complete Bolt Carrier Group (BCG) Unavailable & Discontinued Models
List of Unorderable Models
- USED TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group BCG, Black Nitride, BCG556-LM, EDEMO3, Condition Fair, Other , MPN: BCG556-LM-EDEMO3 , Code: TRB-BCG-AC1-BCG556-LM-EDEMO-OT-D
- USED, TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group BCG, Black Nitride, BCG556-LM , MPN: BCG556-LM-EDEMO , Code: TRB-BCG-AC1-BCG556-LM-EDEMO-IN-C
- USED TRYBE Defense Low-Mass AR-15 5.56 Complete Bolt Carrier Group BCG, Black Nitride, BCG556-LM, EDEMO4, Used, Condition Fair , MPN: BCG556-LM-EDEMO4 , Code: TRB-BCG-AC1-BCG556-LM-EDEMO4
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