Stag 5.56 Double Tap
I have a stag 5.56 piston upper model 8. I have had problems with the gun double tapping. Any ideas what will cause this? I have had 3 different triggers in the gun. the stock trigger, Timney, and a Geissele S3G all trigger have double tapped the stock being the worst with 3 round burst. I'm not thinking its the trigger. The last time I was using a Magpul 20 mag. Any input would be great. Thanks
I had one with a 20 round Pmag and S3G, maybe its the mags? Model 8 upper and lower . It has only happened once so far. I changed out the buffer spring to an LWRC silicon chrome one since then. Not sure if that has been the reason for it not happening again but you may want to consider that spring in conjuction with the Gieselle. Its a completely different rifle after doing just that.
Have someone else shoot the weapon and see if it happens to them.
If it does not then it may be the way you are handling the trigger.
Disconnector hammer retention and even reset distance back to hammer at home are most likely the problems, which may all be stemming back to the receiver FCG channels being a tad off spec.
With the trigger pull all the way back, the hammer cocked to the disco, slowly release the trigger. The hammer should not be released until the trigger is almost all the way back forward at rest. Also to see this relationship between the free space between the hammer back sear, and the disco sear, shotgun the upper open, then cock the hammer down until the hammer back sear is as close as you can get it to the disco sear with the trigger untouched.
The free gap between the two should be in the .001 range ( about that of a human hair), and if the free gap between the two is greater, then it may be time to retime the disco (remove metal from the front/ bottom of the disco where it seats against the front/top of the trigger to decrease the free gap between the two sear when the trigger is at rest).
Also as a reminder, make sure that the disco spring is install large coil side downward into the back trigger slot under the disconnector!!!!