XCR-L Changes / Variations / Options

[Merlin]

Sounds more under gassed than over but if it ejects without failures I wouldn't worry too much about it. Just take everything apart, clean and lube it. Also check your buffer to see if it shows any strikes, if there are it was over gassed at some point.

[omface]

Ok, I will. I had to replace the buffer once I first got it, haven't had any trouble with the new buffer. (About 350 rounds). Original owner said he only put 100 rounds through it and then it sat in his safe, he said the trigger slap bothered him to much. I was hoping it was just a break in issue but after that many rounds the break in period should be over

[Sean K.]

Thanks for all the info, I am working on upgrading my XCR-L(its approx a 2009). When I bought it, it already had the newer gas system (looks like a gen 2). After reading the posts here it says it may cause an over gassed gun. When I adjust the gas setting the brass ejects the same distance, about 10-12 ft, on all settings but S. Is this a symptom of an over gassed gun.

10-12ft is normal and considered optimal by the owner's manual. I'm surprised it doesn't change with higher settings though. I'm wondering if your port sizes are wrong or your gas block isn't sealing correctly.

[Mechanic]

Gas tube holes down makes a difference as well. My 6.8 -L throws about thirty feet on 2, holes up.

[Bravo]

Really!
I've gotta admit, I never tried putting the holes up.
What do you figure the difference is?

[Mechanic]

Really!
I've gotta admit, I never tried putting the holes up.
What do you figure the difference is?

Holes up, the default recommended position I believe, restricts the escaping gas by being very close to the upper, thereby retaining more gas in the tube. Holes down, the gas flows toward the barrel (no material in the upper in this area).

I've tested this on my -L where it would eject on 2 holes up, but fail to extract holes down. Holes down on 3 functioned. It's not a huge difference, but it is there.

[navalbeaver]

I've seen lots of barrels that have carbon build up on the top from the ports on the gas tube. Will have to double check the SBR that launches my casings and see where the holes are.

Fwiw, the parts diagram on the robarm site appears to show the holes in a down position

[Whiskey three six]

Mods, can we pin this thread ?

[navalbeaver]

It has been

[Whiskey three six]

Type 1 gas valve adjustment , Overhead view of Type 1 gas valve, Type 1 gas system above Type 2, Type 1 and Type 2 bolts, Type 1 and Type 2 stock hinge ( viewed from the receiver end ).