I needed to zero my night vision scope in yesterday but in the end all the guns we took got re - zeroed. It took a long time to zero the night vision scope as it was well out but we got there in the end. Griffs guns are top and bottom 22l - 22hornet mine are 22lr - 17hmr.
Use direct fix screws no need for messing with plugs, you need a 6 mm drill bit for hole and the screws tap into hole. How thick is the wood your using for base.