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How does the trigger feel? I would imagine it's spongy considering it's plastic. .
The trigger is decent, and better than some factory triggers. Its not bad at all, really. It's not a Timney, but that's also twice as much as the lower costs
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Yes the fire control group can be replaced with metal parts for an aluminum reciever from what I have read... I am getting two soon and will be putting in some FCG kits that I have sittting on my work bench unless I like the plastic stuff. But we will soon see has I will be using these for .22 guns I have read the polymer hammer doesn't work on the .22lr bolt as it is too fat you have to grind it down. I would rather replace it with a metal one that works instead.
The Fire Control Group is a proprietary design. The parts do NOT interchange with factory mil-spec type fire control groups. You can't swap the polymer hammer for a metal hammer. The lower is "mil spec" in terms of trigger/hammer pin holes, etc. You can drop in any mil spec FCG, but you'll have to drop the entire group in (Hammer, Trigger, disconnector, etc). So, a standard mil spec fire control group will drop in, or Spike's Battle Trigger, etc, etc.