今天在网上看到这段：
“The SIG716 uses a new gas block and valve. These parts mate together with
studs on the valve that fit into grooves in the block. This eliminates the
threads that can get dirty and difficult to unscrew as noted above on the
SIG516.
I'm pleased to note that SIG has now starting using a very similar gas block
on the SIG516.“
holycow 能不能讲讲这个设计？
