Features:

• Designed specifically for True Precision barrels, but ready for most 9mm and .380 barrels with 1/2x28 Threads. 
• Tension lock o-ring for hand-tight installation to prevent back off.
• Made from USA-sourced solid 316L Stainless Steel bar stock.
• Designed, assembled, and machined in the USA.
• The multi-port design includes three slotted 90-degree ports with a tapered front crown to direct gasses away from the muzzle and reduce felt recoil. 
• The overall length is .787".
• Weight: 0.6 oz
• Outside diameter at widest: .745", with a taper to .650" at narrowest (barrel end).