I used a standard tool to remove the fixed tele from my Bushy M4gery and the only thing I would suggest is getting a piece of pipe (the longer the better) and fit it over the end of the wrench to use as leverage. My brother-in-law and I tried for about 20 minutes to get the nut loose, and couldn't. I went into the garage, pulled out a piece of pipe, put it on the end of the wrench, and it just popped right off. It fit on the nut just fine. The wrench I used seemed to be a standard USGI style wrench.