Well that's a good way to sell pmags.. I only use reaction rods when I do any barrel change or muzzle device swap. They are worth every penny you pay for them. If you follow JoeBobs advice, do not use that magazine for shooting again, just order a new mag from their website... Even the magwell vice block's are better than that option. Remember you are putting twisting torque both upper and lower aluminium receivers. Not a good idea with a tight muzzle device. Get the proper tools.
I use a JAL linear device on a 6.8 hunting rig. I feel there's more felt recoil than the 6.8 PRI Quiet Control on my other rifle, but it's much quieter. I like it tremendously, and they are vital if you are shooting from a ground blind.
SHM