Mistake on my part (Centurion Chamber)

AR/M4 AR Technical Discussion
1

I know this sounds like a noob question, however I FINALY finished my build using the Centurion HF LW 16" that I purchased months ago. Ive put under 100 rounds through it the other day, however i had problems with a bushmaster trigger. Bah imagine that.

Anyway, I was unloading the rifle yesterday and found that the round would not extract from the chamber. So I mortared it.

Round came out.
Thought maybe I had a bad handload.
So I chambered another round. Same issue.
I found that they do extract with extremely excessive force.
So, I tried clambering some new PMC.
Same thing.

Weird part is the rifle had no issue extracting rounds when I was at the range sighting in. Cleaned the chamber and the issue still remains. Is it possible that these barrels have much tighter chambers?
I know a match grade 10/22 gun I put together will not unchamber rounds unless they are fired.

Any info would be great as I am temporarily at a loss until I pull my head from my rump and think about this logically.
Thank You.

2

DId you by any chance observe or check the following:

  1. Marks on on your manually ejected rounds that may indicate where the tightness is?
  2. Manual extraction of 223 ammo
    It is listed as a true 5.56 chamber. Id get in touch with Monty if all tests fail or infact indicate a chamber issue.
3

Either the ammo or the rifle has a headspace issue. And it doesn’t sound like the ammo.

4

keep us posted, i have a 16" LW waiting on a rail

5

ah… so you saying you had difficulty moving the bolt rearward while:

  • the bolt is closed and locked?

  • the bolt was out of battery?

was the carrier all the way forward? could you see brass and have difficulty then moving it back?

what type of bolt do you have in & history of use on that bolt?

what type, types ammo did you try this with?

6

Found out what was wrong with it. User error.

I had cleaned the chamber and not the barrel extension.
When I cut the upper to M4 ramps (I know, I know), I got cut short and called to work and never cleaned out the extension.

Aluminum filings obstructing the bolt lungs apparently created some issues only when a round was chamber.

This was about the most ignorant thing Ive done. :suicide2: Live and learn.

BTW - Barrel shoots like a dream.

Thanks for a great product Monty.

7

I still haven’t seen any groups from these barrels. 556, any chance you can tell us what kind of accuracy you’re getting out of your Centurion?

I know they have an MOA guarantee, I am just interested in real world experience thus far.

Thanks.

8

With bad eyes and very hot 55gr I shot ~2" at 100 with irons.

I just handloaded some 77gr Sierra w/ 24gr Varget.
My optic should be here around Tuesday so I’ll post a few pics once I get that on as my groups are not the best with irons.

So between those two I’m hoping to be sub 3/4"
Will update with better info in a few days.

Forgot to add some critical info.
My last build (different barrel) shot 3/4" at 100yd w/ optic
I shot ~2in groups with irons.

9

Holy dog pudding!! Not that I have been without screwups…

Glad it is sorted out.

10

Thanks! I will be looking forward to your range report.

11

556,

How is she shooting? I’m curious how the Centurion shot with your handloads.

Thanks

mtdawg

12

I ended up sending it out to be cut down to 14.5 :smiley:
Just got the barrel back today but I’m waiting for my new TRX Extreme 11" to come in. I should know in a week or so… again.

By the way… Centurion does NICE work.

13

Monty cut it?

14

Just speaking of the product in general.

15

Looking forward to your range report.

I’m also curious to see if you notice a difference in recoil, similar to reports on the BCM 14.5" middies.