I recently modified a Firestrike. I put in a [k25] spring, put some e-tape under the o-ring, removed the air restrictor and dart post, and re-barreled with 1/2" CPVC. I'm hitting 90-100 FPS, which I don't have enough experience to know if it is high or low. However, one issue I'm seeing is that it is chewing trough my darts. I have heard of heads blowing off, but this is not the case. The foam is literally cracking near the head, which allows the air to escape, and I cant re-glue it so the dart is pretty much useless. Does anyone have any clue as to why this is happening, and how to fix it? I have been using somewhat old accustrike darts and a few brand new Adventure Force waffles. I do have to somewhat twist fit the dart in because the CPVC is quite tight.
I included images of the cracked darts, and of the barrel in case there's something wrong with it that I can't see?
Thanks in advance.