
Originally Posted by
MistWolf
When buying a civilian legal M4, we can demand an M4 that meets the all the specs as laid out by the chart. When buying another variant of the AR, that's not practical. The chart only shows the specs for one specific AR variant.
For example, it doesn't make sense to insist on an F height front sight block if the rails will cover the gas block.
Adherence to the chart does not guarantee a quality product, nor does deviation from the chart mean the AR will be garbage. The chart says barrels are to be made from a steel alloy as specified by MIL-B-11595E and be chrome lined. Yet uppers assembled by BCM with stainless steel barrels without chrome lining are considered to be among the best available. KAC, as I understand it, has done away with HPT and they do not stake castle nuts.
This isn't to say the chart isn't useful. One will be served well choosing a civilian M4 based on the information found in therein. But it's just one tool. Like the old saying goes, if the only tool in your kit is a hammer, every problem will start to look like a nail
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