I believe it is the RTR arms.
My original TLR22 (Not RTR) has always been strong and nothing broken even after hard wrecks which I found impressive. As the arms began to develop a little slop I decided to replace them with new arms I had bought on ebay from an RTR kit, feeling they had to be the same material. Well the RTR arms did not even last one full day of practice and wrecks over some big jumps, both of them splitting open from the inner hinge pin hole.
So my conclusion is that to save money on the RTR injected parts, they may have used some "cheaper" material that breaks quite a bit easier than the real 22 race vehicle parts; or it was purely bad luck for me too.
Afterwards I replaced the arms with over the counter 22 rear arms and they are still going strong, just like the first set which are still good, just a little sloppy on the hinge pin holes (and threaded shock hole) after over a year of racing.
My advice, stay away from the RTR plastic parts as much as possible just in case the material is different.
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