Clear scope front element protection

walkabout

Private
Full Member
Minuteman
Feb 21, 2012
103
154
68
Devon, England
I shoot a competition once a year where it's in a giant sand pit.
Lying next to guys really close with .338 brakes blasting sand back at the front of my scope.
Before you say, no I cant move further away from them, 20 guys firing 10/20 rounds at the same time under the clock all in a tight row.
I can screw on a clear filter under a sunshade?
Any other ideas?
Cheers
Mark