New CZ 457 24" 1.180 Match Barrel from L3i
- Thread starter Mark_Dorman
- Start date
Goes away after cleaning and comes back every time the round count gets past 100 or so. I don't have a hard number, but it is very obvious once you're past 200 rounds.
Whidden Gunworks has a cool set here. Seven gauges are included to indicate headspace from .039″ to .045″. Use these to check existing firearms, when installing prefit barrels, or along with Shim Kits to fine-tune headspace to match your ammunition.
I received my Wasp cut barrel today and put it on a receiver. Man, that bolt close but especially bolt open is stiff even without a round chambered. I'm guessing I'll need to use a barrel shim, has each of you needed to use a shim?
I know I need/should get a good tool to measure so I'm not guessing which shim to use.
I know I need/should get a good tool to measure so I'm not guessing which shim to use.
My l3i 457 barrel ran into my 419 rail. I moved the rail back just a bit so that the barrel would seat against the action. I emailed L3i and Marcus said they had to move the rail on their test rifle. He said it still functions fine.
Mine would not close without a shim. I would not advise forcing it closed if it feels that way.
If you don’t have a way to measure, it will have to be trial and error. Maybe start with 5 thousandths and see how it feels to close.
All barrels will need a shim, .003 is the most common shim needed.
my bolt will close with ease without any shim, but to open is REALLY stiff. Still looking for answers, & better performance.
You have mechanical advantage on the close by way of the cam surfaces but on open you do not have the same advantage. You have way too little headspace and are essentially pressing the boltface into the barrel face. You need to properly shim the barrel.
The tenon has an 18mm (.7087) nominal diameter, we have a +.0005 and -.001 on it. Most of the tenons have been running on the highend of the tolerance which make for a snug fit in most actions.
