I took My HK 93 out to clean the other day, did not fire. When reassembling, I had some trouble getting BCG back together, with the bolt head gapped, so the rollers were in. I did get it after several (well many) attempts, but when reassembled, I noticed there was little or no bolt gap, though I did not have feeler gauge, going by eye it looked like none. My question is, when do you check the bolt gap? After firing, or after reassembling after field stripping? Did my problem getting it back together(when I finally had the rollers in, I dropped the bolt vertically down into the receive, free fall) cause a one time problem, or is it going to stay like that with no gap, even after I fire it, and it cycles naturally? Thanks.