Manufactured from premium quality Cold Hammer forged stainless steel blanks 1:10" twist rate Under cut thread intercept to accommodate a wide variety of attachments Threaded A 1/2-28 to accommodate standard muzzle attachments Black Melonite Finished for longevity and durability Expected Results: Direct Drop-in replacement of factory barrel. (No fitting required) Applicable to What Guns: Works in M&P M2.0 Compact 9mm pistols with a factory 3.6" barrel Works in Classic M&P Compact 9mm pistols with a factory 3.5" barrel Mfg: Apex Tactical Specialties Inc