LMT Defense - 5.56 NATO 16" Stainless Steel Barrel Assembly - L7SB1B

The LMT Defense 16" Stainless Steel 5.56 NATO MRP-L Barrel Assembly (L7SB1B) is a premium match-quality barrel designed for LMT's MRP-L Monolithic Rail Platform upper receivers. Machined from stainless steel with a precision 5R rifling cut at a 1:7" twist rate, this barrel offers exceptional accuracy for competition, precision shooting, and long-range 5.56mm applications. The barrel is coated and cryogenically treated for long-term durability and sustained accuracy. LMT cryogenically treats all their barrels to relieve internal stresses and extend service life. Each barrel is individually tested for function and accuracy before shipping. Mid-length gas system provides an optimized dwell time for reliable cycling with a wide variety of 5.56 loads.

• Part Number: L7SB1B (R-L7SB1B)
• Platform: LMT MRP-L (AR-15 light upper receivers)
• Caliber: 5.56x45mm NATO (.223 Remington)
• Barrel Length: 16" (406 mm)
• Rifling Twist Rate: 1:7" RH, 5R cut rifling
• Barrel Material: Stainless steel
• Profile: Government/standard
• Gas System: Mid-length, straight gas tube
• Gas Block: Low-profile gas block included
• Muzzle Device: A2 birdcage flash hider
• Treatment: Cryogenically treated, barrel coated
• Operating Method: Direct impingement
• Barrel Compatibility: LMT MRP-L upper receivers (L7S1A, L7X1A and similar)
• Manufacturer: Lewis Machine & Tool (LMT Defense), Milan, Illinois, USA

Each LMT barrel is shot for function and accuracy, then goes through a rigorous inspection and cleaning process before shipping. Allow 3–5 additional business days for delivery. Barrel only — BCG and upper receiver sold separately.