Zerodown reported: Did you transpire to get any concerns Placing the forearm on from your Knoxx stock? When I set it on my 500a, the forearm was an absolute bitch to get on. Could not even put the nut again on as there isn't a area. Interested to check out https://highimpactrounds.com/product/mossberg-590a1-spx-12-ga-20in-8rd/