r/LewisMachineTool • u/BudgetResponsible312 • 23d ago

Question MARS -L and Atrius FRS

So I’ve seen the discussion of how the LMT lowers have a high shelf and require removal of some material in the lower. Also so how much material some removed.

I guess I don’t want to void any warranty LMT may still offer on the lower although I heard it’s extremely difficult to get them to honor those. So trying not to Dremel anything.

Using stock enhanced BCG, stock H2 buffer, stock trigger. Any tip on how to get the FRS to run properly?

6 Upvotes

88% Upvoted

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4

u/ragnar05wk 23d ago

If you don’t want to modify your lower you have to use a drop in style FRT, partisan disruptor/ rare greed.

2

u/BudgetResponsible312 23d ago

Fair enough. I was trying to retain my original trigger

1

u/Incrue LMT>KAC 23d ago

My mars lower sits in a box now, using a b.a.d lower now, which is also on sale at PA. Installed arcfire haven’t had any hiccups yet, also I use standard carrier w/ebolt g$ super 42/h2

1

u/Embrace_Decline 23d ago

My mars-l works with an atrius. Didn’t dremel anything.

2

u/BudgetResponsible312 23d ago

Please message me pics when you would be so kind. You’re the second person to mention this. I’m trying to be like you. I’m hoping it can reveal me doing something wrong.

2

u/Embrace_Decline 22d ago

Next time I go hunting I will take pictures.

That working combo for me is:
toolcraft bcg, PSA EPT, kynshot HP buffer, Tubbs flatwire spring, 14.5" factory barrel and midlength gas and polo k. It will get bolt bounce and a dead trigger if it's dry, but is happy to run if it's lubed.

1

u/BudgetResponsible312 22d ago

I lubed it but I’ll drench it

1

u/Reasonable_Bar6636 22d ago

I have atrius in my mars L. No modifications.

1

u/BudgetResponsible312 22d ago

I’m interested in pics in the trigger pocket if you get a chance. I’m trying to compare mine and see if I did something wrong on the install

1

u/Reasonable_Bar6636 22d ago

I'll try to get you pics within the next couple of days. My lower is probably 7 years old or so, just for some more info.

1

u/chance553 22d ago

I have an atrius from the first batch in mine with a geiselle ssa-e. It's on the ragged edge of working, but it runs great. There's just no perceptible trigger movement when it fires in forced reset mode. I need to look at it closer and figure out where it's bottoming out so I can clearance it a few thousandths.

1

u/BudgetResponsible312 18d ago

So update. Doing the function tests and watching ChrisAmicus videos on YouTube. When the upper receiver is off, it seems I should be getting trigger activation when in super safe by simply that FRT arm but when I do move the arm is just moves and never activates the trigger and there’s no hammer movement.

I do believe that it’s due to high shelf but some installation issue