My Shogun 500 has a chain with links labeled; VIA UG 5E

After pushing the pin most of the way out, and then pushing it back in after a bottom bracket service, that link now does not flex freely.

So...what kind of chain is this, and what master link would work for it? If it is a KMC, they list two pin lengths for their connectors, 7.1 and 7.3.

Thanks in advance for any help offered!