another weired bolt stick issue

[Remagk]

my back up stock mag with air valve and Lv7 had bolt stick issue, I had try all the spacer but no luck to fix it, it is any other thing I had to look into?
the best I tune it is with .300 spacer and experience 1 bolt stick out of 20 shoot, and when I degass it (disconnect the QD) to dissamble the valve I heard gas leak from bolt that usually won't happen this way (atleast to me).
Please help me out although I don't use this gun much but it is a loaner to my friend.

[Remagk]

anyone have clue????

[athomas]

Replace the bolt spring. A weak one can cause bolt stick. They can weaken over time just being in the gun due to the spring being constantly compressed.