So I ordered a few stock parts from Treeline and added a Sadlack NM guide rod spring guide to the order. I went and installed tonight and when I pull the charging handle all the way to the rear, it sticks there. This is going into a dominion socom 18. I am curious if anyone has experienced this and how they fixed it. Thanks.
Installed Sadlak Op Rod spring guide and now op rod sticks to rear?
- Thread starter Gillen1
- Start date
Could anyone tell me the outside diameter of the black arrow? I could always put the sadlak on the lathe at work and turn it down a bit.
The plan is to re peen it and use some wicking loctite on it. I will be going out for new roll pins tomorrow as I do not have the size needed in my home kit. I agree with the cat food tin quality pins though. I use roll pins all the time at work, never seen one break up like this. It cracked and looks like it de laminated itself as well.
You will want to make sure that the op rod guide and barrel are properly indexed with the receiver. Often these parts are not perfectly aligned from the factory, which likely wouldn't be an issue until you install a round op rod spring guide
DaveMachine
CGN Ultra frequent flyer
- Location
- That one place with a cowboy complex
Had a similar issue on my DA S18. I had to stone down the flat portion at the rear of the guide to get it to fit/function properly. I went slow and constantly checked and it wound up fitting nicely.
Well, I figured I'd take a chance at modifying the Sadlak before I went and bought a Black arrow. I took a nice fine file and started removing material until I had no binding. Tried to take an even amount off all sides. Was conflicted if I should file the Sadlak writing off but I did. Reblued once I had a problem free opperation. No problems now and I am able to use a Norinco and USGI spring with no issues.
Yes, bound up to the point where it would stick in the rear position. I filed enough material off to get smooth action.
It would bind with either spring. The Sadlak guide rod would not go on the Chinese spring unless I twisted it on. So hard to mix them up. Either way, now both spring types work and the guide rod does not have the slop it used to. I will assume that the od of the sadlak rod and spring made it too tight in the op rod.
m14medic.ca
Expried Business Member
- Location
- Regina SK Canada
If the Sadlak guide rod is binding, and you are not using a Chinese spring, there are only 2 remaining possible issues....
1- your op-rod guide is off centre of the op-rods travel. If the op-rod is hitting the gas piston square and true, then your barrel needs to indexed to square up the “moving bits” to the “unmoving bits”....
2- your op-rod is bent or manufactured out of spec and is not suitable for use with a NM op-rod guide rod.
If you’re altering the guide rod then it isn’t going to help accuracy, you might as well just use the OEM stamped flat guide. It’s up to you tho, but I’m a big proponent of fixing the actual issue instead of altering NM parts to work with out of spec parts.
John
1- your op-rod guide is off centre of the op-rods travel. If the op-rod is hitting the gas piston square and true, then your barrel needs to indexed to square up the “moving bits” to the “unmoving bits”....
2- your op-rod is bent or manufactured out of spec and is not suitable for use with a NM op-rod guide rod.
If you’re altering the guide rod then it isn’t going to help accuracy, you might as well just use the OEM stamped flat guide. It’s up to you tho, but I’m a big proponent of fixing the actual issue instead of altering NM parts to work with out of spec parts.
John
