RichardS
Well-known member
You apparently don't have a Rifle w/s installed !! The plastic screw threads are slight wack of being the same pitch as the metal ones. Wish I could post pics, I even had to add nuts & bolts to the top of my Yama mask to keep the top corners down on the Rifle. I had whistling problems with the mask on both the stock Yama & Rifle w/s.