I personally prefer tuning with a fixed head but to each his own. I tuned with the G5 Striker then shot the the Tekan and put the Tekan through the same hole the Striker went through. Good heads but I have not had a chance to take an animal yet, hopefully this weekend will change that. I will testify that G5 has top notch customer service. I had some trouble with a head a couple weeks ago and G5 rectified the situation with no questions asked. Awesome service along with a very good product.
FWIW: Use the practice blades they send you in the package. Otherwise you could have a very hard time getting the head out of the target.
FWIW: Use the practice blades they send you in the package. Otherwise you could have a very hard time getting the head out of the target.