After about 5000 rounds, my SAR-1 developed a horrible case of the upper handguard wobbles. The movement was not a forward-backward motion but more of a side to side as the gas tube could rotate a bit in its seat in both directions.
Searching for a permament solution (aside from moving back the gas block back
), I thought of putting the little retaining springs common on AK-74 rifles on my SAR-1. Mike @ ORF sent me one to try out but told me that it may not fit as the '47 gas tube did not have the little notches cut in it to accomodate the spring.
But after a lot of effort, and sore thumbs, I got it on there. I just relieved a bit of the "bend" in the spring, making it a bit flatter, and therefore easier to get on. But now that it is on I would say that it has gotten rid of 95% of the wobble in the upper handguard. So anyone out there looking for a good solution, I suggest giving this a try.