First range trip with the R2. Was super excited and forgot to check thoughout the 150rd session. After letting it cool before taking off, I went to unscrew it from the qd mount and found it was loose at the suppressor to Kurz mount. Had not started to unthread but turned loose with literally no pressure. I hand tightened it back and then immediately tried again and it stayed on and came of the qd like normal. Is this common? I was sure to clean threads and used the spanner wrenches to get it has tight has I possibly could before shooting. Talk about a pucker moment when I grabbed it and found it loose...I think I almost had a heart attack!!!