Like the title says I need to be schooled on something that I’ve even doing for years and apparently wrong. I have about 7-8 years building ars for myself and I just found out via a brownells YouTube vid just this morning that I have been installing flash hiders incorrectly , Iv been using a mag block with the full ar assembled then clocking on the flash hider on. That’s the way I was taught by a gunsmith back in the day. I do use a torque wrench ,shims and a magpul armors wrench, bev block when I do uppers. I did hear that a bunch of stuff can shear/break off when you use the method I was using. I kinda freaked out and took apart all my ars and lowers and inspected them all ,they all look to be ok. No cracked lower takedown holes ( upper or lowers ) , no sheared barrel index pins and no cracked uppers. Was the way I was doing it a old school way or was the gunsmith just jurry rigging it? I even went as far as pulling out of storage and checking the first ar I built ( Anderson upper/lower set , spikes lpk, dpms carbine h barrel ) and everything looks to be ok even under a magnifying glass and flashlight. Am I just stupid lucky that nothing broke ? Obviously I will now be using the magpul bev block for both barrel nut and flash hiders now. I would imagine that the torque that it takes to clock on a barrel nut far exceeds what it takes to that of a flash hider ? Sorry for the long post, Any and all info is very helpful.