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ArmaLite Buna 70 Extractor O-ring. FN America Cam Pin. FN America Firing Pin. FN America Ejector Pin. FN America Extractor Pin. FN America Ejector. FN America Extractor Buffer. The BCG is subject to extreme pressures and temperatures as it harnesses the gas from the Direct Impingement DI gas system to cycle the rifle. With each shot the BCG violently travels to the rear of the rifle into the buffer tube where it is stopped and returned by the buffer and buffer spring. Bolt carrier for sale in a semi-automatic firearm, this process can happen multiple times per second depending on the skill of the shooter.
The reliability of your AR depends heavily upon your bolt carrier group. Choosing a BCG can be overwhelming given the multitude of choices on the market. Understanding which BCG is right for you will involve an examination of your intended use, performance requirements, budget and desired aesthetics. Key components of an AR15 bolt carrier group include the carrier, bolt assembly with Bolt carrier for salegas key, cam pin, firing pin retainer pin, and the firing pin.
Many enthusiasts like to build AR rifles and it is important to know exactly how the firearm works. We are going to briefly cover a simplified description of how the BCG functions. As the bullet passes the gas port, some of the expanding gas travels through the gasblock into the gas tube. The moving carrier cocks the hammer preparing the fire control group for the next shot. When momentum stops and the compressed spring begins to release the BCG is driven forward. If the magazine is not empty, the bolt head will push a bullet up a feed ramp into the chamber. This enables the bolt to withstand the extreme pressures produced by firing a round.
Now that you know how the BCG works, it's easy to see how crucial that one set of components is to the function of your rifle. The U. The reality today is that not all BCGs are created equal and which one you choose for your rifle is subject to a variety of factors. One benefit of the AR platform is the ability to switch calibers by swapping a complete upper or by Bolt carrier for sale the barrel, bolt, and magazine. The M16 BCG is the de used by the military and is rated for full-auto fire.
Basically, M16 BCGs are slightly heavier to slow the rate of fire for automatic or burst fire.
On average, M16 BCGs weigh The de is reliable, and with decades of proven combat effectiveness, M16 BCGs have earned their favor with American gun-owners. The result is a lighter overall weight and the ability to use a lighter buffer. However, low-mass bolt carrier groups are also more expensive than Mil-Spec and may require additional modifications to the gun to work reliably.
When you reduce that weight, Bolt carrier for sale gas pressure may become too strong and cause reliability issues. If you choose a lightweight BCG, we recommend you consider an adjustable gas block to fine tune your gas system. We also recommend purchasing lighter buffers and, in some cases, lighter springs. When properly configured, they are ideal for competition shooters where any improvement in speed can give Bolt carrier for sale edge over competitors.
Today, there are an incredible of coating options that you can find for a BCG. Technology and innovation have advanced ificantly since the Vietnam War, and modern BCG coatings can easily outperform the traditional phosphates. Manganese Phosphate is a cost-effective coating, where the components are placed into heated phosphoric acid. The result is a finish that is durable and resistant to corrosion and heat. The combination of low cost, high durability, and military use make phosphate-coated BCGs the most popular coating on the market.
This causes friction as the action operates, which requires larger amounts of lubrication for the firearm to function reliably. More lubrication also means that the components will attract more dirt and debris.
The rough surface also makes cleaning difficult and time consuming. Phosphate coated BCGs need regular cleaning maintenance to function reliably.
The manganese phosphate bolt carrier group is a basic component for shooters that want a simple, Mil-Spec style AR Backed by over 50 years of combat-proven service in the military, it has become the most popular BCG coating and it gets the job done effectively.
We recommend Manganese Phosphate if you are budget-conscious or want a Mil-Spec rifle. No frills: it just works. The nitride coating process is a high temperature nitrocarburizing chemical treatment that creates Bolt carrier for sale smooth, hardened black surface. Nitride coatings have a high durability and corrosion resistance.
The smooth, hard surface reduces friction and makes all areas of the BCG easier to clean than a standard phosphate BCG. Nitride coated bolt carrier groups are an upgrade over the basic phosphate coating. They are great for shooters that want an easier cleaning experience, smoother action, and the look of the black nitride finish.
Electroless nickel coating is a chemical process where a layer of nickel metal alloy, most commonly nickel boron, is deposited onto all surface components of a bolt carrier group. Electroless nickel coatings are very slick with a low coefficient of friction. They require minimal lubricants and are very easy to clean.
Many shooters prefer the smooth operation Bolt carrier for sale their actions with quality nickel boron BCGs. Because the coating is nickel, the surface appearance is shiny metal and may not be suitable for those that like an all-black AR We recommend Electroless Nickel coatings for marksmen that have a little more budget and want to upgrade their shooting and maintenance experience. Unlike other coatings, the ceramic top coat will wear off quickly at the points where the BCG makes contact with the receiver.
On a BCG with a nickel boron coating, this wear exposes the undercoat, allowing the shooter to experience the benefits of reduced friction.
Ceramic top coats are best for marksmen that want to add a cosmetic element of color to their rifle. They are most often used with a nickel boron coating, where the user wants the benefits of higher lubricity, but does not like the shiny metal.
The Physical Vapor Deposition PVD coating process uses a vacuum, high temperatures, and evaporation, or sputtering, to create an extremely thin, hard, and slick coating on BCG surfaces. PVD coatings are among Bolt carrier for sale lowest coefficients of friction available. The surfaces are very slippery and require minimal lubrication. Physical vapor deposition coatings are difficult to apply and require considerable capital expenditures, which considerably increases the cost of these BCGs.
The coating process is also line-of-sight, so complex components like a BCG will have slightly varying degrees of coating thickness in Bolt carrier for sale areas. PVD coatings come in black, plus some exotic colors for ARs like gold, silver, and bronze. Physical vapor deposition coated BCGs deliver ificant performance upgrades, but at a high cost.
We recommend PVD for competitors that need every additional edge possible for performance. When you combine the different types and coatings on bolt carrier groups, your field of choices expands considerably. Ultimately it comes down to your preference. How much improvement you want to make in performance and appearance is limited only by your budget.
While not a requirement for operation in your AR, more advanced coatings definitely make cleaning easier, increase reliability, and can add some style to your black rifle. Many Manufacturers use cutting-edge proprietary coatings and make some of the best BCGs on the market.
Now that you know everything about your next Bolt Carrier Group, browse our vast selection of BCGs here at Primary Arms, your one-stop-shop online gun store. Here you will find industry-leading customer service and fast shipping. If you have any questions, don't hesitate to send us a message at info primaryarms. Adjustable Adjustable.
Caliber or Gauge. Platform AR In Stock. Add To Compare. What is a bolt carrier group? How does a bolt carrier group work?
What are the types of AR bolt carrier groups? What is a lightweight BCG? What are the BCG coating options? What is Manganese Phosphate coating? Pros Cons 1 Most economical coating on the market High coefficient of friction, requires more lubricant to operate smoothly 2 Durable and corrosion resistant BCG must be disassembled and cleaned regularly 3 Trusted by the military Rough surface texture makes cleaning more difficult.Bolt carrier for sale
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AR 15 - Bolt Carrier Groups and Parts