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Well my 870HD did not come with dimples in the mag tube.It came and does come with a factory extension.I don't know about how many barrel parts,it has a barrel with a ring on it and would consider it as durable as the Police model minus the finish.The PC safety is cheap and easy enough to change.The reason people didn't like it was supposdely you can turn the safety without the key.There was a concern of a slight chance of it accidently engaging at a bad moment.As far as the "plastic" trigger housing,in some respects may be more durable.Synthetics have "give" in them,aluminum can crack,corrode, etc.A steel housing can bend or be crushed rendering the gun unfireable.We have gun frames made of plastics like the Glock,I do not find a plastic trigger housing an issue,maybe in cost but certainly not durability.
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