I bought the 1187 pistol grip ATI stock but converted it to my SP10 - I will say this the ATI is one solidly built item , its  some kind of glass resin reinforced plastic , its some tough stuff - the recoil pad is a 
stiff horrible brick with zero cushion - chopped down the LOP and installed a R3 pad , stippled it with a soldering iron , painted it , and am very happy with it now - 
this is a picture of the gun , one on the top --

I have a ATI folding model  for my home Mossberg pump , and again a good sturdy item