Does anyone know what milspec buffer tubes are the best to buy? Does it matter what brand you buy? I have a LWCR M6A3. I just bought it but while removing the staked castle nut which was pretty hard to say the least, I kinda grinded the threads on my brand new buffer tube. I was pissed to say the least. It prob happened because I didnt know what I was doing at first or just dumb luck. Anyway I installed my new Magpul ASAP plate and then while putting the castle nut back on i kinda reamed the castle nut too. Grrr what a drag. I was using the Armorer AR15 wrench from BravoCo. The ASAP plate does not allow that wrench to be fully square on the castle nut so it kept slipping which burred the castle nut notches. So I have to get a new castle nut too. Brand new rifle and messed it up already. Does anyone recommend a different wrench or a better wrench for the castle nut, etc?? Thanks