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(Best Bolt Carrier Groups For AR-15)
✅ Featured Products for Best Bolt Carrier Groups For AR-15
0:58 4. JP Enterprises Mass Bolt Carrier ➜ http://bit.ly/38lEgI9
1:50 3. Spikes Tactical 5.56 NATO ➜ http://bit.ly/2LLaswP
2:50 2. Runner-up: Bravo Company M16 ➜ http://bit.ly/34v20Z2
3:43 1. Best Overall: Daniel Defense 5.56 NATO ➜ http://bit.ly/3rcsLLT
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Detailed review: https://www.gunmann.com/ar-15-bolt-carrier-group/
💡 Since the bolt carrier is the primary functioning part of an AR-15, it should flawlessly deliver optimum performance. There are several important factors you must consider before choosing a BCG for your AR-15 rifle.
The first and foremost thing to consider is the material. BCGs are generally made of steel, although aluminum, titanium, and hybrid models are also available on the market.
The steel is further classified into different classes, but the most common ones for manufacturing BCGs are 9310 and Carpenter 158 Steel.
🔩 Heat Treatment and Shot Peening:
Materials used for manufacturing BCGs must be properly treated and processed to deliver optimum performance. Heat treatment refers to subjecting the steel to high temperatures and then cooling it to impart tensile strength and remove fatigue.
Shot peening is the process in which tiny metal balls are shot at the steel to relieve stress from the metal. A BCG that has undergone heat treatment and shot peening assures you of its strength and quality.
🔩 Inner Chrome Lining:
According to mil-spec requirements, the bolt carrier group must be chrome-lined on the inside. This provides a smoother and corrosion-resistant surface on the inside, increasing the life of the BCG and making it easier to clean.
The bolt carrier group undergoes enormous gas pressure every time a shot is fired. The gas key is secured to the carrier using two hex screws, which also prevent the gases from escaping. These screws are staked (metal on their sides is smashed onto them) so they cannot move due to the high gas pressure beneath. This also eliminates the chance of any accidental failures in the future.
🔩 HPT and MPI Tested:
To ensure the quality and reliability of their product, manufacturers put their BCGs through two very rigorous test procedures to find any defects in the products. These methods are HPT (High-Pressure Testing) and MPI (Magnetic Particle Inspection).
Weight is always a matter of concern when it comes to firearms. Choosing a lightweight BCG over a standard one can mean a substantial difference (up to six ounces) in weight.
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