Hi - I'm doing some research on your AR BCG before a bulk purchase and the one item that seems to vary from the "norm" of a high quality bolt is the lack of shot peening of the bolt - apparent the carrier is. I searched and found this statement that I've highlighted in red.
Quoted:
The bolt should not be shot peened only the carrier that's the mil spec also we do not do HPT due to the extra strain it causes its actually a bad idea and we only do it when we are required to for a large sale. We do however strongly believe in MPI and we do that process on our bolts.
Our extractors are 4140 steel milled from bar stock.
Our* keys are 4350 I believe and also machined from bar stock as well.
Could you help me understand why you deem that shot peening the bolt is not necessary? I am not an materials engineer, but everything I've read, including some scientific studies seem to point to the fact that shot peening helps with fatigue life and overall durability of the metal bolt / gear etc. I know there is intense debate about C158 vs. 9310 But this is the first time I've seen it mention that shot peeing an AR bolt is not beneficial and or necessary. You guys seem like you know what you are doing especially based on your contract to produce carriers - but I'd really like a bit of understanding about the bolt.
Thanks, and looking forward to your reply.