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  • Trigger Supply Rainbow PVD BCG | High Polish AR-15 Bolt Carrier Group | USA Made

Trigger Supply Rainbow PVD BCG | High Polish AR-15 Bolt Carrier Group | USA Made

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Details

Trigger Supply · Rainbow PVD · High Polish · M16 Cut · Carpenter 158 · MPI · USA Made

The Trigger Supply Rainbow PVD BCG is the build piece that makes your AR-15 stand out without sacrificing anything on reliability. Physical Vapor Deposition coating over high-polished components produces the iridescent rainbow finish — every unit catches light differently. Under that finish is a fully spec’d Carpenter 158 steel bolt, M16 cut carrier, mil-spec gas rings and O-ring, and magnetic particle inspection on every bolt before it ships.

It looks like nothing else on the market. It runs like a mil-spec BCG should.

What Makes It Different

Rainbow PVD Finish

Physical Vapor Deposition deposits an extremely thin, molecularly bonded coating that produces the iridescent rainbow color. Harder than phosphate, does not chip or peel. The finish is applied over high-polished components — the polish is what gives the reflection, the PVD is what gives the color and durability.

High Polished Components

Every carrier and bolt surface is polished before PVD coating. The result is a mirror-quality finish that no standard BCG produces. High polish also reduces friction at contact surfaces for smoother cycling — form and function together.

Features

  • Rainbow PVD finish — Physical Vapor Deposition iridescent coating over high-polished components. Harder than phosphate, bonds at molecular level
  • Carpenter 158 steel bolt — the original mil-spec bolt alloy specified by the US military. Chrome-moly-vanadium formulated specifically for bolt lugs under repeated firing stress
  • Magnetic particle inspected (MPI) — every bolt inspected for internal defects before leaving the factory. The most reliable non-destructive testing method for bolt integrity
  • M16 full auto cut carrier — heavier carrier profile for smoother, more reliable cycling. Functions as standard semi-auto in any mil-spec lower
  • Mil-spec gas rings — standard mil-spec gas ring set for consistent gas seal and reliable cycling
  • Mil-spec O-ring — standard mil-spec O-ring for gas retention
  • 8740 steel firing pin — hard chrome finish — high-strength firing pin alloy with hard chrome plating for long-term durability
  • 4140 steel cam pin and extractor — standard mil-spec alloys for both components
  • 100% USA made — all components manufactured domestically

Component Steel Breakdown

Carrier

9310 Steel — Rainbow PVD finish over high polish

Bolt

Carpenter 158 Steel — MPI tested, Rainbow PVD finish

Firing Pin

8740 Steel — hard chrome finish

Cam Pin

4140 Steel — mil-spec

Extractor

4140 Steel — mil-spec

Gas Rings

Mil-spec — standard ring set

O-Ring

Mil-spec

Full Specs

Caliber .223 Rem / 5.56 NATO
Carrier Profile M16 Full Auto Cut
Finish Rainbow PVD over High Polish
Carrier Material 9310 Steel
Bolt Material Carpenter 158 Steel
Extractor Material 4140 Steel
Cam Pin Material 4140 Steel
Firing Pin Material 8740 Steel — Hard Chrome Finish
Gas Rings Mil-Spec
O-Ring Mil-Spec
Inspection Magnetic Particle Inspected (MPI)
Platform AR-15 — all mil-spec uppers
Country of Origin 100% USA Made

Frequently Asked Questions

What is PVD finish on an AR-15 BCG?
PVD stands for Physical Vapor Deposition — a vacuum coating process that deposits an extremely thin, hard layer of material onto the surface of the BCG. PVD produces the rainbow iridescent color while adding a harder, more wear-resistant surface than standard phosphate or nitride. The high polish preparation before PVD gives the finish its mirror-like reflective quality.
What steel is the bolt made from?
Carpenter 158 steel — the original mil-spec bolt alloy specified by the US military for M16 and AR-15 bolts. It is a chrome-moly-vanadium alloy specifically formulated for bolt lug stress under repeated firing cycles. Every bolt is magnetic particle inspected (MPI) for internal defects before leaving the factory.
Is this BCG M16 cut?
Yes. M16 full auto cut carrier profile. In a semi-auto lower it functions identically to a standard BCG — the M16 cut adds mass for smoother, more reliable cycling. Compatible with all mil-spec AR-15 uppers. Legal in all 50 states in semi-auto builds.
Will the rainbow PVD finish hold up under hard use?
PVD is one of the hardest surface coatings available for firearm components — harder than phosphate and comparable to nitride. It bonds at a molecular level and does not chip or peel like paint. The rainbow color remains vibrant under normal use and cleaning. Like all BCG finishes, sustained high round counts and harsh cleaning chemicals will show wear over time.
What makes this different from a standard mil-spec BCG?
Three things: Rainbow PVD finish over high-polished components, Carpenter 158 steel bolt (the original mil-spec alloy), and magnetic particle inspection on every bolt. Everything else — M16 cut, mil-spec gas rings, mil-spec O-ring, 4140 cam pin, 8740 firing pin — runs to standard mil-spec tolerances.
Is this made in the USA?
Yes. 100% USA made.

Shipping & Returns

All sales are final; we do not offer refunds or exchanges. Items that arrive damaged or defective are covered under the manufacturer's warranty — contact us within 5 days of delivery and we will help coordinate a claim.

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