Originally Posted by
JediGuy
After being quite proud of myself for completing 100% of my lower myself (and wife for the bolt catch) and the barrel/rail installation without a scratch or hiccup... I believe I overtorqued my flash hider on the nice, brand new BRT barrel (sorry). The flash hider is an A2 from Anderson; I’m sure that was my first mistake, but I wanted to keep this basic the muzzle device simple, and of all things, I didn’t think an inexpensive flash hider would make a difference.
I used a torque wrench and thoroughly coated the threads in Aeroshell, but missed the 20# click, instead focusing on ‘getting it aligned.’ I know I went well over 20#. Probably about 270 degrees of rotation with resistance.
Initially, I approached this as “what the heck, my mistake, hopefully it doesn’t affect much” but then did some reading on here and decided to pull off the flash hider (it came off very easily). Now the crush washer is deformed enough to not come off easily, so I’ve read a couple old threads on how to go about that.
My question: How screwed am I? I don’t know how many # of torque were applied, though I can’t imagine it was super high; a standard torque wrench was used, so not super long or anything. Is this going to cause permanent and/or noticable damage to the barrel? The goal was for this to be a compact precision gun rather than for speed shooting.
Crush washers are called 'constant torque washers' in the Colt Canada Armorer's Manual and 'recessed washer' in the TM. The range of movement is 90 degrees minimum to 450 degrees maximum (1/4 to 1 1/4 turns).
So you didn't over torque yours. ETA: Both the Colt Canada and the TM noted there is no torque specification. Apparently the torque doesn't vary much betweein 90 and 450 degrees.
I use this shim kit: https://www.brownells.com/rifle-part...prod38890.aspx
and Rocksett: http://www.flexbar.com/shop/pc/ROCKSETT-2-OZ-p4019.htm
Last edited by 26 Inf; 07-30-18 at 23:23.
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