15" Lo-Pro Slope Nose MLOK­™ Quad Rail (LPSN15-MLOK)

The 15" LO-PRO SLOPE NOSE M-LOK Free Float Quad Rail was developed to accommodate the features of our 7.5" LPSN quad rail to a longer 15" version. The LPSN15 M-LOK was inspired by beneficial features that shooters have requested and demanded from us and other manufacturers. M-LOK is a modular locking accessory mounting system that is a direct attachment method for hard mounting accessories to a negative space mounting point. Designed by Magpul Industries as an evolution of the MOE® slot system used since 2007. The slender light weight design, longer nose, ease of installation and superior construction and finish quality are some of the features that we designed into this system. The LPSN15 M-LOK undergoes a rigorous extra de-burring process in order to ensure a smoother snag free finish. The details and level of care during the manufacturing of the LPSN15 M-LOK makes it the perfect choice for your AR-15 rifle build.

Built-in QD mounts with internal stops.

Inner diameter: 1.35"

Not compatible with .308

Click HERE to view install instructions

Click Here for Product FAQ Page

GSA Contract: GS-07F-0403M, Schedule 84

Prop 65 Warning

In stock
Item Price: $150.00
Overall Length:
15 inches
Product Weight:
9.5 oz
Assembled Weight:
13.5 oz
Made in the U.S.A.

Built-in QD mounts with internal stops

Built-in QD mounts with internal stops

Steel barrel nut and mounting hardware included

Steel barrel nut and mounting hardware included


True-Fit Technology utilized on the LPSN15™

True-Fit Technology utilized with the LPSN15

Phase 5’s True-fit technology was developed to secure the rail system onto the barrel nut with an accurate and solid full contact method around the entire surface area. The Phase 5 Weapon Systems Inc. True-fit rail attachment system gives the operator peace of mind and confidence that the system will not move or come loose. This is accomplished with 6 screws that form the rail with our True Fit feature around the barrel nut without distorting or pinching the rail at the bottom like in other rails on the market. Phase 5’s True-fit rail attachment system allows for the repeated removal and reinstallation of the rail without fatigue.True-fit


  • 6061 T6 aluminum
  • Low Profile sleek design
  • Light weight for improved mobility
  • Steel barrel nut and mounting hardware included
  • Type III Hard Anodized Mil-Spec finish (black)