Hope my fellow CGNers can help.
I picked up my CX4 yesterday from the gunsmith after having the non-restricted barrel conversion and de-restriction done with the CFO.
I performed a test after assembly quickly in the store and it seemed okay.
On getting the CX4 home, however, I noticed the trigger would intermittently malfunction a lot. The trigger would travel all the way rearward but with little resistance or it would catch and then there would be no resistance. The hammer would not fall or release.
The trigger only releases the hammer consistently when the upper is not attached to the lower.
With the upper attached, the trigger fails to release the hammer unless there is some leftward force applied to the trigger.
Looking at the rifle more closely, it appears the bolt is sitting forward just a little too far when closed and this is causing the underside of the bolt to just engage the disconnection "nub" on the trigger bar (on the rearward slope of the recess on the underside of the bolt for the disconnector "nub")
If I shift the bolt back as little as 1-2 mm, the trigger operates the hammer consistently regardless of any lateral forces on the trigger.
Pushing the trigger to the left appears to slightly warp the trigger housing, forcing the trigger bar to sit lower and preventing the disconnector "nub" from contacting the bolt in closed battery position.
It is my suspicion that the barrel is sitting too far forward in the upper (by 1 to 2 mm) or that the chamber end of the barrel is dimensionally just a bit short, allowing the bolt to move too far forward and causing this malfunction.
My suspicion is further heightened by the fact that the plastic in front of the charging handle is slightly deformed, suggesting to me the bolt is riding forward a little too far.
Does this make sense? Has anyone encountered this before?
Could those of you with CX4s post pics of your ejection ports with the bolt in the closed position apics as well as the front of the charging handle slot?
Thanks.
I picked up my CX4 yesterday from the gunsmith after having the non-restricted barrel conversion and de-restriction done with the CFO.
I performed a test after assembly quickly in the store and it seemed okay.
On getting the CX4 home, however, I noticed the trigger would intermittently malfunction a lot. The trigger would travel all the way rearward but with little resistance or it would catch and then there would be no resistance. The hammer would not fall or release.
The trigger only releases the hammer consistently when the upper is not attached to the lower.
With the upper attached, the trigger fails to release the hammer unless there is some leftward force applied to the trigger.
Looking at the rifle more closely, it appears the bolt is sitting forward just a little too far when closed and this is causing the underside of the bolt to just engage the disconnection "nub" on the trigger bar (on the rearward slope of the recess on the underside of the bolt for the disconnector "nub")
If I shift the bolt back as little as 1-2 mm, the trigger operates the hammer consistently regardless of any lateral forces on the trigger.
Pushing the trigger to the left appears to slightly warp the trigger housing, forcing the trigger bar to sit lower and preventing the disconnector "nub" from contacting the bolt in closed battery position.
It is my suspicion that the barrel is sitting too far forward in the upper (by 1 to 2 mm) or that the chamber end of the barrel is dimensionally just a bit short, allowing the bolt to move too far forward and causing this malfunction.
My suspicion is further heightened by the fact that the plastic in front of the charging handle is slightly deformed, suggesting to me the bolt is riding forward a little too far.
Does this make sense? Has anyone encountered this before?
Could those of you with CX4s post pics of your ejection ports with the bolt in the closed position apics as well as the front of the charging handle slot?
Thanks.
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