The mk 1 apex grade threaded 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.

Length: 4.25"
Model: Apex Grade
Twist: 1:10"
Finish: Stainless
Barrel Type: Threaded