Defensive Arts
Oregon Arms & Ammunition
Low Price Guns
HighLine Firearms
Sporting Systems
Gun Deals
Advertise on Northwest Firearms
Simply Triggers
Buster Beaver Cerakote
Oregon Rifleworks
J&B Firearm Sales

Gunsmith test time

Status
Not open for further replies.
Messages
2,360
Reactions
801
Had a neighboring LE agency bring an AR to me, saying it won't cycle. It acts like a single shot rifle.

What's wrong?
 
OP
wichaka
Messages
2,360
Reactions
801
Fires, but does not eject.

I will let this run until later tonight.......and I'll give the answer and post some pics.
 
OP
wichaka
Messages
2,360
Reactions
801
Nice try with all........and contrary to popular belief, you don't need to mix up the slots in the gas rings. Every time the bolt cycles, the gas rings move around.

Here's a hint;

bcg1.jpg
 
Last edited:
OP
wichaka
Messages
2,360
Reactions
801
I was always told to stagger those :confused:
....and we were told Anna Nichole Smith married for love.

Next time we get together, I pull out a bolt, align the ring gaps, put it back together, and it'll fire/cycle just fine.

If you don't think those rings spin around.........align the rings, then cycle the bolt 10-20 times, just like firing off a magazine. Take out the bolt and see what position the rings are in.


Rumor #1 about the AR, always make sure the gaps of the gas rings are not aligned............UGH!
 
Last edited:
Messages
209
Reactions
17
Hm. Does smell like a gas system problem. For whatever reason the pressure difference between the gas system and the buffer spring is too low. I guess the problem could be on either end - the gas system is clogged, the FSB/gas block is off the slot, or the buffer spring is too strong (might be using one designed for hotter military ammo in a rifle loaded with very weak commercial loads...).
Gas key might be loose, or, going back to the rings, one of the gas rings may be compressed or damaged. My money is on the gas key, though. Theres a lot of force being exerted at a funny angle on that part.
 
OP
wichaka
Messages
2,360
Reactions
801
Hm. Does smell like a gas system problem. My money is on the gas key, though. Theres a lot of force being exerted at a funny angle on that part.
We have a winner!

The pic above should have given it away. Look at the lack of staking of the gas key screws, a spider monkey with a marshmallow hammer could have done better!
The gas key came loose, exhausting the gases out around the key, not allowing a build up of enough pressure to cycle the bolt carrier.

We won't go into what make this was........unless you really wanna know.

Pic 2;

bcg2.jpg
 
Status
Not open for further replies.

UPCOMING EVENTS

Oakanogan Gun Show
Oakanogan County Fairgrounds
175 Rodeo Trail, Okanogan, WA 98840, USA
Cerberus Training Group - Run the Gun Pistol
Cerberus Training Group
47 Cattle Dr, Goldendale, WA 98620, USA
Cerberus Training Group - Run the Gun Rifle
Cerberus Training Group
47 Cattle Dr, Goldendale, WA 98620, USA

LATEST RESOURCE REVIEWS

  • Adaptive Firing Solutions
    5.00 star(s)
    Steve is awesome. He's helped me with two Form 4 transfers so far. I live 45 minutes away and happily make the drive to support such a great vendor!
  • TJ Gun Sales
    2.00 star(s)
    My form 4 cleared on 04/10/2020 I had to fight tooth and nail for TJ's to find my tax stamp. There was never any urgency or concern in their...
  • Lucky Sporting Goods
    5.00 star(s)
    Excellent service
  • 36 Pit
    3.00 star(s)
    I'm probably just reiterating what others have said, but I like hearing (seeing) myself speak. This gets 3 stars because when the place isn't...
  • Cascade Loan & Sporting Goods
    3.00 star(s)
    I am giving this review because at one time I was a really big customer there. Back in the day, I bought at least a dozen used guns from Cascade...
Top Bottom