I received my G&P M870 foregrip. The inside diameter of the foregrip is a little bit smaller than one inch and the APS forend tube is 1 inch and a 1/16 thick so it does not fit. The G&P foregrip is also 1/2 inch longer than the APS one. Overall, it requires alot of modification...
Here's my 870
Now I need to find a 20oz CO2 paintball canister to see if it can be treaded to the loading tool, the 12g are too inconsistent!