C93 Hk Clone Stock Wobble Issue

[Indiana Jones]

Hi Everyone,

I hope you're all doing well. It's been a while. I'm seeking some knowledge from those of you well versed in roller delayed guns. I have a Century C93 that has some wobble where the backplate meets the receiver with the takedown pin being the fulcrum. It moves about an 1/8 of an inch, maybe a bit more. I have to induce this so I'm not concerned with accuracy. My concern is that perhaps beating the bolt carrier against it, or something might be taking unnecessary wear and tear. I'm using an Hk 93 backplate, with a wood G3 stock. No problem with the backplate-wood stock fitment, just the backplate to the receiver. I've been lucky with this C93, and this is the only "issue" I've run into with fitment or really anything. I will post pictures when I get home, probably video too.

I mainly want to know if I'm causing damage, and if there is a way I can shim it to stop the wobble.

Thanks for any help you can provide.

Dr Jones

 

[ken792]

Look for roller imprints in the receiver raceways at the back. That would be a sign of excessive bolt velocity if it were the case.

Look to see if the rear pin hole is getting egged out too.

Check the bolt gap to make sure it’s 0.010-0.018,” Too large would result in excessive bolt velocity.

 

[Indiana Jones]

Look for roller imprints in the receiver raceways at the back. That would be a sign of excessive bolt velocity if it were the case.

Look to see if the rear pin hole is getting egged out too.

Check the bolt gap to make sure it’s 0.010-0.018,” Too large would result in excessive bolt velocity.

VERY much appreciated. I'll inspect this when I get home. Do you know of a way to measure that without feeler gauges? I have calipers.

 

[ken792]

VERY much appreciated. I'll inspect this when I get home. Do you know of a way to measure that without feeler gauges? I have calipers.

Get some $2 or whatever feeler gauges

 

[Indiana Jones]

Get some $2 or whatever feeler gauges

I'll make a run to the hardware store, good call. For some reason I thought it was a specialty Hk item. Doh! Thanks again.

 

[Boss94]

do you have a buffered bolt? if not that would certainly help.