I have a Rem LVSF 22-250 with the J-lock and want to replace the firing pin assembly? What would be a good upgrade firing pin assembly? I have been looking at Tubbs Speedlock firing pin assembly,but I really don.t know what to get. Also the silver aluminum bolt shrouds that come with the firing pin assembly look way to shiny to match my LVSF, can they be bead blasted to match. Any info would be very helpful. Thanks Tom