....There is likely a substantial locking piece that's out of sight.
That's all I was thinking, the out of sight part.
The vertical bolting and rib extension may be somewhat apparent, but I wouldn't know if they function in a similar way to conventional designs. That rolling block is huge, and on outward appearances, there does not seem to be the packaging space to provide substantial resistance. There may be a requirement for a large void under that block, and that rising bite may be responsible for quite a bit more than on a fixed standing breech?
