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The Spikes Tactical M16 Lightweight BCG takes a proven full-auto-profile carrier, shaves away material to drop the mass, and wraps the whole assembly in a nickel boron finish that runs slick as glass. It's aimed at folks building lighter, faster-cycling ARs where reducing reciprocating weight helps cut down on bolt bounce and speeds up lock time. The carrier is machined from 8620 tool steel and the bolt from Carpenter 158 steel, so you're not giving up toughness to chase a lower weight. Tipping the scales right around 10.5 oz, it's a real-world lightweight option that still drops into most mil-spec 5.56, .223, and .300 Blackout uppers.
Nickel boron is harder and smoother than hard chrome, which is where a lot of this BCG's appeal comes from. That slick surface means carbon and fouling wipe away with far less scrubbing, and the group can run nearly lube-free for thousands of rounds. The coating goes inside and out on the bolt, carrier, and gas key, and it won't chip, peel, or flake off over time. Plenty of owners mention how easy it is to clean and how smooth it feels running in the receiver.
Every detail here is done to mil-spec standards. The bolt is shot peened and both High Pressure Tested and Magnetic Particle Inspected (HPT/MPI) to catch any material defects before it ever ships. The forged gas key is attached with grade 8 hardware and properly staked, and you get a tool steel extractor with a mil-spec spring, black insert, and Viton O-ring for reliable extraction. The shrouded firing pin and laser-engraved Spikes spider logo round out a carrier that looks as good as it runs.
This is the same lightweight nickel boron BCG Spikes Tactical uses in their own builds, and it's backed by their lifetime warranty. Whether you're finishing a race gun, a skeletonized showpiece, or just want a smoother-running upper, it's a solid drop-in upgrade. Keep in mind an M16-profile carrier in a semi-auto AR-15 will not make the rifle fire full-auto.
No. An M16-profile bolt carrier installed in a standard semi-auto AR-15 will not make the gun fire full-auto. The M16 cut simply refers to the carrier profile, which is a common and popular choice for AR-15 builds because of its added mass at the rear. Your rifle's fire control group determines how it functions, not the carrier.
It's built for 5.56 NATO, .223 Remington, and .300 Blackout, so it covers the most common AR-15 chamberings. It comes fully assembled and drops into most mil-spec AR-15, M4, and M16 uppers. If your barrel is chambered in one of those three, you're good to go.
It does. Nickel boron is smoother and harder than hard chrome, which lets the carrier cycle with minimal lubrication for thousands of rounds. It also makes cleanup a breeze since carbon wipes away instead of caking on, and the finish won't chip, peel, or flake.
This carrier weighs right around 10.5 oz, shaving roughly an ounce off a standard M16 carrier by machining away excess material. That reduced reciprocating mass helps decrease lock time and bolt bounce, which is why it's popular for competition and race gun builds. It's a noticeable difference when you're chasing faster split times.
| UPC | 855319005518 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ST5BG05 |
| Color | Silver |
| Model | |
| Product Type | Bolt Carrier Group |
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