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The retaining pin is what holds the firing pin in place. 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. Heavy is good.

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This pin keeps the bolt from over-rotating when the gas key unlocks it. 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. 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。. 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?

This is what allows the BCG to lock and unlock during the firing cycle. 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。. Because of this, FA BCGs have become the default over the past decade or so.

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。. This is also what contacts the buffer and pushes the spring to the rear as gas expands inside it. 「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，.

The gas key is what moves gas from the gas tube and into the bolt carrier itself. The bolt face is the piece that grabs each new round to be chambered and the spent casing to be ejected. 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.

During the firing cycle, it slows down the unlocking of the bolt and the extraction of the fired case. Heavy is reliable. Bolt Carrier : This is the bulk of the BCG and is the piece that holds everything else together. This is also what unlocks the bolt and allows the whole assembly to move to the rear.

Cam Pin : Lastly, we have the cam pin, which is inserted through the side of the carrier and a hole in the bolt. It also has a hole in the middle for the firing pin to pass through, which helps keep everything oriented properly.

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The firing pin protrudes from the bolt face and is of course what strikes the primer of the round to fire it. Despite the name, a full-auto or M16 bolt carrier group does not actually make your firearm fully automatic.

With high pressure and temperatures, quality material and design are key here. Rather, these are parts that are designed to work with full-auto parts in a select-fire trigger group. This allows chamber pressure to dissipate making extraction of the fired case more reliable and consistent.