When purchasing Brownells or any other brand from eGoods365.com store, you can be sure that (a) you are purchasing from US based company with the most responsive and friendly customer service; (b) an authentic, not a counterfeit and not a refurbished product.

The Brownells AR-15 Chrome Bolt Carrier Groups are suitable for those who want to equip their tactical rifle with a low-friction bolt-carrier group that is easy to clean. They are also great for those who're aiming to build a Model 601 or an XM16E1. The bolt inside each of these groups is made of 9130 tool steel and is surrounded by a carrier made of 8620 hardened steel. Other essential parts like the extractor, gas key, and cam pin are also plated with chrome for protection against corrosion and for a smooth surface that's easier to clean. These bolt-carrier groups can work with any rifle chambered in 5.56 NATO, .223 Remington, or 300 Blackout, but they are not compatible with full-auto lower receivers. The Brownells AR-15 Chrome Bolt Carrier Groups are available with or without forward-assist serrations. The non-serrated model is best for early AR-15s like the Air Force Model 601, while the serrated model works great for early XM16E1 rifles from the mid-1960s.