Put one in both. its just stopping the gas from going the wrong way. and for the break in, i just left my bolt locked open for about a month and after the secound mag she fed fine on 2 3/4in 7.5 one ounce shot.Oh thank goodness!!!
I found a broken rubber O ring on the threaded post that holds the recoil spring and no one (including the manufacturer) can tell me where it goes. I'm pretty sure it goes inside the gas block it self. Here are some pics. The 1st is the o ring 2nd where I found it and 3rd is a picture of the gas block. I put one o ring in one of the slots (red box) for illustrative purposes.
And again, thanks for answering.