Sterling Arms R18 Mk2 - trigger mod

sportytourer

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So I have a r18 bought 2023 but it is the model before it came with the trigger tech trigger.
New models of the R18 now come with the trigger tech duty trigger which is fixed and single stage 3.5lb pull.
I can see why they went with trigger tech for a better trigger as the gun comes across as premium but IMO the trigger is lacking.
Mine is a single stage with a bit grippy creep meaning it catches at different points as I squeezed and needed 9.5 pounds to release the hammer.
This is a new gun so expected it to need break in but not this much...
I separated the rifle so I could cycle the trigger and catch the hammer with my thumb to simulate a few hundred rounds firing but did not really notice any change.
I examined the trigger and found that the sear spring had a lot of tension.

I first decided to polish the trigger end and the sear with 600grit, then 1000 grit then polish to smooth things out.
This brought the trigger pull from 9.5lbs down to 7.4lbs and a smoother pull with less catching as it creeped.

7.4lbs was still not what I wanted so I bent the hammer spring next so less pressure on the sear.
That plus a tiny bit of grease got the pull down to 5.4lbs and similar creep but less catchy.

If I wanted a lower trigger pull (which I do) I would need to bend the hammer spring more which is doable but at this point I am going to try it at the range before going any further.

To make this with less creep I suspect you would need to file the sear a bit and that is not what I want to gamble with at present either.

So overall a bit of polish and bit of bending the hammer spring and the trigger pull weight is reasonable.
You can look up any trigger polish you tube video for ar15 to get an idea of what to do.
 
Sounds like you understand how most of it works and you are smart enough to take small bites at the Apple before you choke.

Follow your heart. You can get lighter springs you don't have to bend them. After a few thousand rounds you will get a very obvious witness mark where the sear and hammer touch and that should allow you to decide if you can safely reduce that engagement. Apply the safety and see how much wiggle you get in the assembly. If there's lots of wiggle, reducing sear and hammer engagement might not be wise
 
I am probably going to get a trigger tech for this gun so was not planning on buying any other parts just modify what is OEM.
Hope to get to the range this week once I get my scope mounted and see how it does first with barrel break in n cycling then decide where to go.
Will post results here....
 
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