5/8-28 TPI is NOT industry standard, but is appropriate for custom installations. The .875 outside diameter will accommodate medium to heavy contour barrels including, but not limited to, AR-10 type rifles and bolt guns. The JPRE-428S/30 has a final exit hole of .350. The final exit hole of the JPRE-428S/30 can be enlarged to accommodate bores up to .416.
Product Instructions

Price: $69.95