CZ/VZ ammo issue- Chicom vrs ComBloc

Doc911

Doc911

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Seems my CZ's/VZ's don't like the Chicom copper washed steel cased, for 'real' running and gunning.
'Failure to feed'; round 1/2 inserted into chamber, before the bolt carrier stops on the forward action, with the Chicom stuff.
Combloc (Cech, Romanian, etc) lacquered steel case feeds/runs fine- never a stoppage.

Doesn't occur (often..) off the bench, but controlled pairs/ hammers (and multiples there of) will cause the malf, in dynamic training.
Anyone else have this issue..??
 
In my 11.75" CSA and my 18.5" XCR. In my XCR I even run it at setting 1 on the regulator where Czech has to go on 2.

Sounds like you've got extra drag slowing your bolt down. I just can't see why that would be the case with the copper washed over the lacquered. I've seen and heard of brass cased ammo causing extra drag, but not copper-washed steel.
 
Huh.
It's bad in my 7.5 shorties, and occasional, in my 11.75's.
Case shoulders look like they're binding, on the way up the ramp..

Probably a 'gas impulse' issue, or case hardening issue w/ the ammo?

By the way, saw your pic in the Canam M14 shorty thread....looks cold, and I have the 'urban friendly' (read 'smaller'...) seacan version, in MY backyard..!
Also, PM inbound, IRT this summers training regime..
 
I can't say if either of those could be the cause. Maybe smooth out the inside edges of the feed lips? I've had to knock the sharp edge off on some LAR mags to get brass ammo to feed better.

It wasn't that cold yesterday. Only -2 or so.;) That's our range. I wish I had a seacan in my back yard.
 
So maybe a mag issue?
I was thinking maybe a bottom of feed ramp issue, myself. The same mags worked fine, w/ the combloc..

Trust me, on the seacan...the wife won't mind...;)

Guess I need to get up to PR, as I knew it wasn't GP...!
 
i had this issue with the copper washed russian surplus , but not with the Czech , to solve the problem i grinded every sharp edge where the ammo got stuck , be careful to not remove too much stock , that solved my problem
 
Doc911 said:
So maybe a mag issue?
I was thinking maybe a bottom of feed ramp issue, myself. The same mags worked fine, w/ the combloc..

Trust me, on the seacan...the wife won't mind...;)

Guess I need to get up to PR, as I knew it wasn't GP...!
Click to expand...

Like Dad003 says, smooth out the sharp edges that contact the ammo. Likely it's mostly the mags.

For whatever reason, there's extra drag from somewhere, slowing the feed process down.
 
Doc911 said:
Seems my CZ's/VZ's don't like the Chicom copper washed steel cased, for 'real' running and gunning.
'Failure to feed'; round 1/2 inserted into chamber, before the bolt carrier stops on the forward action, with the Chicom stuff.
Combloc (Cech, Romanian, etc) lacquered steel case feeds/runs fine- never a stoppage.

Doesn't occur (often..) off the bench, but controlled pairs/ hammers (and multiples there of) will cause the malf, in dynamic training.
Anyone else have this issue..??
Click to expand...
Sounds like you got lacquer build up on your chamber. Time to break out the JB bore bright and a brass m14 chamber cleaning tool and polish that chamber. After it looks like a mirrored finish it should be gto again.
If that don't work then you will have to get a gun smith to enlarge the gas vent port. I think it will be this route to solve your issue but try the first one as it will be the cheapest of the 2 fixes.
 
Doesn't sound like gas at all to me - If there's enough gas to extract, eject, and pick up the next round, then there's enough gas. Right?

OP describes a feeding issue. Doc, if you can post photos of the misfeeds, it might help. Without seeing it, it's tough to diagnose. Like Stevo says, it's probably drag somewhere in the forward cycle, possibly on the bolt, possibly on the feeding surfaces of the receiver or chamber.

I run an NR CZ858, and I've had exactly one fail to feed over three cases of ammo (one PRC and two Czech). I think my ftf was with Czech.
 
Nope cause it might just be having enough to cycle it but not properly close the bcg.
As for dragging on something. Unless the T lock plate is not properly engaged I do not see how this is possible on the CSA re-worked receiver models.
alpining said:
Doesn't sound like gas at all to me - If there's enough gas to extract, eject, and pick up the next round, then there's enough gas. Right?

OP describes a feeding issue. Doc, if you can post photos of the misfeeds, it might help. Without seeing it, it's tough to diagnose. Like Stevo says, it's probably drag somewhere in the forward cycle, possibly on the bolt, possibly on the feeding surfaces of the receiver or chamber.

I run an NR CZ858, and I've had exactly one fail to feed over three cases of ammo (one PRC and two Czech). I think my ftf was with Czech.
Click to expand...
 
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