If your Brazos Sx is older then 2 1/2 years I think it has a stock type Recoil Master in it, give Bob a call, he is making custom recoil master or somthing like that,I put one in my older Sx and it is a lot flater now. I used standard guide rod and a 9 lbs. spring for a little time and did not like it, it was not 100%