QBZ95 has a rail for Optical sights or night vision..but that's only for the PLA standard sights and accessories with this kind of standard"
dovetail rail "
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nowadays
Picatinny rail(MIL-STD-1913) has become an International standard ...there are all kinds of Sights and Tactics Accessories in the market...so when the QBZ95 was commissioned in around 1997. the modification schemes kept emerging in large numbers to "ADD" Picatinny rails on the rifle...and we saw these modification design were chosen by the Elite Infantary unit, Special force and Police force units...
the following is the collected such modification schemes which appeared in chronological order in the past 15 years...
1.two simple "Rail adapter based on dovetail rail: designs from a Hongkong group..
a long top rail with two short rails on both sides and fixed on the original rail and front sight..
two kinds of top rails
interesting, rail on rail...the sloping handle top is a problem..
2. an interesting "Z" shape adapter which could lower the Line of Sight...a good design and we used to like it very much, but we could only see it in early 2000s in Chengdu city Police SF unit...and a 4-rail module was fixed on the barrel...
3. still a 'two parts' design : a top rail with two rails on the barrel..a little bit high for that top rail..
4. another great design from a Hongkong Gun Player...it has been mentioned in above post ...the key feature is 'Rail' design around the handguard and the fixing point is on the front sight.
four rails scheme(under rail is skimmed )
five rails scheme