Bolt size for mounting 1100 stock on 870

canucklehead

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Calgary, AB
Hey guys,

I'm trying to mount a Choate pistol grip stock for an 11-87/1100 on my Norinco HP9.

I know it CAN be done, with the proper length of bolt.

Can anyone here tell me from experience what that length (and thread pitch) should be?

Any help would be greatly appreciated!
 
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