Continuing the discussion from Knocking on the AR15 door:
For the few $ more I would set the EPT as the lower limit to a kit I would get.
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Yep EPT FCG on both of my PSA lowers.
$35 upgrade for about $10 and it’s already installed on EPT complete lowers.
Specs/description:
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The ept is a great single stage trigger, especially for beginners.
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Maybe not all, but in my 20 years experience in the military 99% of rifles are issued with single stage triggers. We won 2 world wars with them. Unless you are a match shooter, absolutely nothing wrong with single stage. If you can’t hit what your aiming at you ain’t doin it right. 
I was able to qualify as expert marksman routinely on .38, 9mm and M-16/M4. And I probably sucked compared to an Army Infantry Rifleman - They have to hit targets at 300 & 600 yards with iron sights.
To me two stage is just another (trigger) safety, but they work great too, and are on several pistols that I own.
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Machining marks. They shouldnt be there but it doesnt matter. All its doing is striking the firin pin.
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Don’t see that with mil spec and my BRD OCD just takes it a little further…then l can rest from Intrusive hauntings 
I do
PSA
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Will check them out when I get back to Georgia, down in Florida working this week 
P.S. I think when they say polished it is the mating surfaces that interact. I don’t think the firing pin cares - it’s just along for the ride in a 3 car pile up - it is getting a ticket too, for following too close to the primer…
However your hammer was given he royal treatment and it shows they really do care. Probably cost more $$ though…
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Those are grinder marks. The face of the hammer is ground flat to ensure it is square to the hammer pin and the lower receiver. The only parts that are polished in an EPT trigger are the sear and trigger mating surfaces.
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Delete
Mine is identical, I thought it was just lazy and poor craftsmanship myself. It works but guess cutting corners for savings. Can see firing pin strike also, maybe soft?. 
Is a 100 dollar kit though.
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Just so everybody is clear the Hammer Spring Saddle goes on the other side of the Hammer for installation.
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Its not a big deal. Probably a cutter was getting near the end of its life.
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The important part is it hits square to the firing pin, otherwise it will peen your firing pin over over time.
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It’s plenty hard brother no worries there. Takes me about 30 minutes of stoning and buff. I did a few basically for dedicated 22’s little BCG. I do run one untouched on a 5.56. Composite tho is a different animal
Mil spec
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I don’t give it a second thought
If it shoots reliably, it shoots
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OCD is real 
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The hammers on the 6/7 year old PSA lowers I may or may not have handled recently all have grinder marks. Those grooves act as lubricant reservoirs same as the honing marks on an engine cylinder wall. I would not mess with them.
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Yeah for sure, I just thought it was interesting it looks just like Fox image. I pull the trigger it goes bang, I mean the whole lower kit was cheaper than a single stage decent trigger so all good to me.
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