Apex Tactical SPECIALTIES 105053 Apex Grade Semi Drop-In 9mm Luger 4.25" S&W M&P Stainless The Mk 1 Apex Grade Semi Drop-In 4.25" Barrel Is Designed For The 9mm Smith & Wesson M&P. Due To The Tolerance variations In The M&P Slide, The Barrel Is Semi Drop-In. In Some Cases, This Means The Barrel May Drop-In Without Alteration, But In Most Cases Will Likely Require Minor Fitting Which Is Easily Done By The End-User. The Stainless Steel Barrel features a 1:10 Twist Rate. The Design increases Accuracy Performance Making The M&P Capable Of Shooting as Small as a 1-1/2 Inch Grouping at 25 yards.
