by Bmt85 » Sat Aug 26, 2017 6:04 pm
The standard threads for a 450B is 11/16-24. There are a few options available. Most common around here is ross schuler's brake. Very inexpensive, yet very effective. Tromix is about the same price and has had good reviews, too.
As to a crush washer, rule is don't reuse themafter they've been installed, but I'm not really aware of anyone that offers one for 11/16 threads, so you might want to try it. You could try reaming out one for a 308 (5/8 threads). If you do, I've been told stick to YHM or DPMS, because they will actually crush down, unlike a lot the others. Another option is a shim kit from Badger Ridge. Only bad thing about them is the O.D. is a bit over sized, so depending on the brake you use, they might stick out and look a little funky. I currently run the shims with a Schuler brake, and they stick out a bit. Doesn't really bother me though.