Norinco Homeland Security 780 = DEATH TRAP
A very strong word of caution to those contemplating firing that model... DON'T! Your life is worth more...
I bought one over the weekend for $75 strictly for the firing pin and to have spare parts for my Dominions Arms Grizzly 12.5 inch shotty,
The Firing Pin retaining pin would not come out and literally swallowed my 1/8 steel punch whole which broke off in bolt permanently trapping the firing pin inside. (the punch likely cost more than the firing pin)
Before this I had tried simply swapping out the entire bolt assembly with the DA Grizzly but they would not interchange...
And even prior to this I cleaned up the HS 780 in hopes of testing it, however in doing so pieces of pot-metal began shearing off the slide bar tracks when cycling the pump which led to the bolt failing to lock closed.
Had I fired it I would, without a doubt, be in the hospital right now with lacerations to my face possibly fighting for my life...
Finally in conclusion this is truly the only suitable reaction to the problems with this death trap, as I would not gift this POS to my worst enemy or nor dare return it to the seller for a full refund, it's simply just that unsafe: