It's one of those little things that can stop your training dead in its tracks. Handheld dummy launchers (like the RRT) don't work very well without the O ring. The O-ring is what keeps the gas inside that is created by the load and it shoots the dummy in the air.
I have seen o rings last for years and I have seen them fail in weeks. Always keep a few spares on hand to replace yours as needed.
Bought the o-rings for the launcher to have extras, since I wasn't sure how long they lasted. I bought the launcher because I broke my leg in a hunting fall and was in a cast. I could operate the launcher, and my dog can retrieve and loves the extra training. Since he's an upland dog, pheasant mainly, dokken needs a pheasant dummy for the launcher.
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