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The big difference is the bolt carrier group is left intact at the rear and has a large lug on the bottom designed to trip a full-auto sear. This is also what unlocks the bolt and allows the whole assembly to move to the rear. This is the part that engages with the full-auto-sear release in a select-fire firearm.

This is what allows the BCG to lock and unlock during the firing cycle.

Bloomberg News quot quot

Rather, these are parts that are designed to work with full-auto parts in a select-fire trigger group. The full-auto bolt-carrier group has extra weight, usually about 1 oz more than a semi-auto BCG. This extra weight acts much like going to a heavier buffer.

The bolt carrier group or BCG is what allows the firearm to chamber a round, ignite the primer, unlock from the chamber, push the buffer, and cycle the firearm again to fire another round. So, to be clear, a full-auto BCG will not make your gun fully automatic, so don't expect full auto fire with a simple Mtype BCG.

Why, then, do we bother with full-auto bolt-carrier groups these days in civilian guns? 彭博新闻社在全球拥有约家新闻分社和约2,名新闻专业人员。 创始人（Michael R. Bloomberg，又译作）。 彭博社是全球最大的金融信息服务供应商，其数据终端系统“ 彭博专业服务 ”可以帮助客户查阅和分析实时的金融市场数据，并进行交易。. 上面是彭博新闻社的app，下面是Bloomberg Anywhere也即终端机的移动端。 同一条新闻，notify的时间相差八分钟。.

Heavy is reliable. The gas key is what moves gas from the gas tube and into the bolt carrier itself. Just to reiterate, by itself, a bolt carrier group will not create a fully-automatic AR, and there are currently no legal restrictions on them as it is the lower receiver and trigger group that are actually the restricted parts.

「熟练使用 Bloomberg」到底需要多熟练？ 熟练哪些内容？ 谢谢各位大牛回答><其实很好奇 彭博机有没有“官方说明书”的存在？ 特别是function list 虽然command line关键字搜索还挺 显示全部 关注者 5, 年末，彭博新闻社买下了该杂志， 并更名为《彭博商业周刊》（Bloomberg Businessweek） 从上述的的文字描述能得出已问题的答案了，下面是对问题的总结性描述 《商业周刊中文版》是Business Week在中国发行的版本，.

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The bolt face is the piece that grabs each new round to be chambered and the spent casing to be ejected. 布隆伯格（Michael R. Bloomberg）。 彭博社是全球最大的金融信息服务供应商，其数据终端系统“彭博专业服务”可以帮助客户查阅和分析实时的金融市场数据，并进行交易。. Bolt Carrier : This is the bulk of the BCG and is the piece that holds everything else together.

During the firing cycle, it slows down the unlocking of the bolt and the extraction of the fired case. Because of this, FA BCGs have become the default over the past decade or so. It also has a hole in the middle for the firing pin to pass through, which helps keep everything oriented properly.

This is also what contacts the buffer and pushes the spring to the rear as gas expands inside it. The firing pin protrudes from the bolt face and is of course what strikes the primer of the round to fire it. It also means more mass when the BCG is coming forward to feed the next round into the chamber.

The retaining pin is what holds the firing pin in place. Despite the name, a full-auto or M16 bolt carrier group does not actually make your firearm fully automatic. This pin keeps the bolt from over-rotating when the gas key unlocks it.

With high pressure and temperatures, quality material and design are key here. Cam Pin : Lastly, we have the cam pin, which is inserted through the side of the carrier and a hole in the bolt. This allows chamber pressure to dissipate making extraction of the fired case more reliable and consistent.

Heavy is good.