Rather than requiring the installation of an adjustable gas block, the company designed an adjustable bolt carrier group. In an AR-15 that uses the Stoner gas system, the bolt carrier group acts as the gas piston. However, a reduction in the weight of the bolt carrier group can require an adjustable gas system. ![]() almost half the weight of a standard mil-spec BCG. This reduces the weight of the bolt carrier group to a mere 5.95 oz. 2A Armament designed a composite bolt carrier group consisting of a Grade 5 titanium (6AL-4V) main body and a 7075-T6 aluminum rear. The solution, then, is to substitute a material that is lighter than steel but stronger than aluminum. Unfortunately, many ultra-lightweight options, such as those made from aluminum, are less durable and experience a reduction in service life. 4. 2A Armament Titanium Regulated Bolt CarrierĪlthough a lightweight steel bolt carrier can improve your rifle’s performance, it’s not the lightest option available. Bear in mind that a low-mass bolt carrier group, in reciprocating at a higher velocity, will increase wear.įor added corrosion resistance, ODIN Works applies a salt-bath nitriding treatment, which also provides a hard wearing surface and increasing lubricity. You may need to adjust the gas system or buffer and action spring assembly to ensure reliable performance, however. While there are lighter options available, which are machined from aluminum, these do not offer the same longevity. weight reduction compared to standard mil-spec offerings. However, a key difference from standard bolt carrier groups is that ODIN Works has machined several slots into the carrier to reduce weight. ODIN Works’ Low Mass 223 Nitride Bolt Carrier uses a 9310 alloy-steel bolt and 8620 carrier. A consistent release and a short reset can increase your effective firing rate.Īnother is to alter the weight of the bolt carrier group, which can increase the bolt velocity and cyclic rate of your rifle. One is to upgrade your fire control group, reducing the weight, pre-travel, and reset. If you need to reduce the time interval between shots, there are various ways to accomplish this goal. 3. ODIN Works Low Mass 223 Nitride Bolt Carrier Group As Nanoweapon is applied at low temperatures, there’s no risk of the treatment affecting the mechanical properties of the steel. ![]() The company then applies a chrome-nitride coating called Nanoweapon, which increases both wear and corrosion resistance. Geissele chose to manufacture this part using H13 tool steel, which is hard and tough, reducing its susceptibility to breakage. The cam pin is under considerable stress and is a known failure point. The forging process compresses the grain structure of the steel, increasing its strength and service life compared with standard billet-machined parts. One of the most notable features of the Enhanced Bolt Carrier Group, however, is that it’s forged. While the bolt is manufactured from Carpenter 158, Geissele collaborated with Carpenter Steel to produce an alloy variant with fewer impurities called Carpenter 158+. ![]() However, that’s where the similarities end. The bolt is Carpenter 158, the bolt carrier is 8620, and the gas key is staked and torqued. On the surface, the Enhanced Bolt Carrier Group appears to be mil-spec. Geissele Automatics, known for manufacturing competition-grade trigger assemblies in use by special operations forces, has taken a novel approach to bolt carrier groups.
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