Armalite AR50 buttstock screws

The two bolts that secure the stock to the chassis ?
If so, the bolt specs are ;
5/16-18 hex socket cap screw
2-1/8" OAL, with 1-15/16" being threaded.
7/16" Dia head with 5/32 Hex socket.
Something like this might work with some machining to fit it, but in less of a quantity.
Screw
 
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