Seven box cannons, by rights, already belonged to Gao Yang, but before confirming that all the guns were functional and, as Federer claimed, all accessories were original, the procedure couldn't be completed, and payment couldn't be made. The transaction could only be completed after test firing and verification.
For antique guns, the difference between functional and non-functional could mean sky-high price variations, and it's crucial that all parts be original. Otherwise, the value would differ by several times.
Federer's gun prices are very high, far exceeding the market rate, so even without Gao Yang's request, Federer had to take the initiative to disassemble the guns for Gao Yang to inspect their interior condition. Now that Gao Yang wanted to go to the shooting range with him, the verification would naturally be done there after arriving.
