The Apex Grade Gunsmith Fit Barrel for the S&W M&P is available in either a 5.00" or 4.25" option. The barrel requires fitting by a competent gunsmith. 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-inch grouping at 25 yards. Accuracy test results based on use of a mechanical rest. Final results may vary based on shooter ability, ammunition selection, and variations in factory firearm tolerances.
Optimal performance is seen with bullet weights of 115gr. Through 147 gr. Using 9mm jacketed ammunition. Works with all S&W M&P pistols requiring a 5.00" or 4.25" barrel. Patent Pending.
Big Book Catalog, Issue:71, Page:219