That is sweet looking....but the supressor would never make it past an NRA tech/jury at weigh in, you could shoot the Match but the scores wouldn't count toward awards or Classification.
Check the NRA Rule Book (you should have read it by now if you are going to compete)
down load the link, it's in pdf....then you can sit and read it waiting for spring.
I know the link is already on here in at least 10 posts, but here it goes again:
http://www.nrahq.org/compete/RuleBooks/HPR/hpr-index.pdf
Section 3-EQUIPMENT AND AMMUNITION reads as this:
3.16.1 Compensators and Muzzle Brakes - The use of compensators or muzzle brakes is prohibited. An
extension tube that has been installed on the muzzle of a rifle to extend the sight radius shall not be considered a “muzzle brake”. The extension tube must have an interior diameter of .5 inches or greater and may have 1/4” x 1” slots cut at 12 and 6 o’clock to remove cleaning patches. Threaded holes along the top of this tube for the installation of sight bases will be allowed.
(a) Sound suppressors are not authorized for use in high power competition.
I know, your thinking I'm not shooting High Power......but yes you are, F-Class is an extention of it and Rules are Rules.