Not for smith and wesson m&p10 - KynSHOT AR-10 7.62mm/.308 Recoil Buffer w/ Standard Collapsible Stock

I tried this RB5005 in my 308 mp10 with a 18" barrel. I found that this buffer would not operate consistently and would prevent the bolt from properly feeding rounds. Basically short stoked. It would also not consistently lock the bolt back on an empty mag. Lastly I reached out to Kynshot and they never responded. For that I would not recommend the brand or product.