This rule has done the full circle from not checked, to must be replaced at 10 years, and has now returned to "may be checked at equipment control and advisory recommendations may be given" stated in ISSF rule 6.7.7.1 (g) , i.e. it is now near enough irrelavent.
Forget it, just use it as a bargaining point, but even in top level matches it is now just an "advisory" at equipment control, if they don't leak, don't worry about them.
Good Shooting
Robin
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?