• Apex Grade - M&P Barrel 4" Drop in 9MM

Apex Grade - M&P Barrel 4" Drop in 9MM


hat It Does 


The Mk 1 Apex Grade Semi Drop-In 5.00" 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. 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.


Expected Results 

– Direct replacement of factory 5.00" barrel 

– Improves accuracy 

– Optimal performance seen with bullet weights of 115gr. through 147gr. using 9mm jacketed ammunition 

– Due to variations in factory slide tolerances, slight fitting may be required and is easily performed by the end user

Applicable To What Gun(s) 

Works with all Smith & Wesson 9mm M&P pistols requiring a 5.00” barrel.

In The Package 

1 ea. Mk 1 Apex Grade 9mm Semi Drop-In Barrel - 5.00"

Installation Resources 


Apex Grade Semi Drop-In Installation PDF



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Apex Grade - M&P Barrel 4" Drop in 9MM

  • Brand: Apex
  • Product Code: APEX-105-053
  • Availability:
  • $329.95
  • Ex Tax: $286.91

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