This post is borrowed from the LWRC forum.
And a bit 'o piston porn.
Having spent time with both the HK416 and LWRC M6A2/A1 on the range, I'd say go with the LWRC. You could buy an M6A1/A2 complete carbine or upper now. Many of the dealers carry some stock even with the huge demands for them. It's up to you. The HK is a good gun, but the LWRC has features that make it superior in my opinion. While HK is offering CHF barrels, keep in mind that CHF barrels are not all the same. LWRC has access to a lot of new technology that will make their CHF barrels even more durable than the uber-barrels. Let me just say the chrome lining is so 20th century. In addition the LWRC retains a high level of parts commonality with traditional AR's which is especially important on the modern battlefield.
Here's a list of features the LWRC has that make it superior to any other piston operated AR style weapon. This info has come from numerous individuals to include current LWRC employees Darren, Jesse, and Jason.
LWRC piston operated gas system
- 100% of all carbon, fouling, and debris that doesn't leave the muzzle are vented out of the piston cup under the handguards. This may not seem important, but it reduces the visual and auditory signature especially when running the gun suppressed. The LWRC is, apples for apples, the quietest AR style rifle available when suppressed.
- Little to no heat transfer to bolt parts
- Any excess gas that does not leave the muzzle vents through three small bleed off valves on the piston cup
- Gas system is self regulating
- Gas system not affected by the presence of water
- Multiple piece pusher rod assembly rather than single piece reduces the potential for catastrophic failure in the event of a high pressure round.
- User removable without tools
- Cold hammer forged barrel with unique LWRC surface conversion process
- Free floating
- Easily resists damage caused by obstructed bore occurrences and/or extreme extended firing sessions
- Will easily exceed 30,000 rounds with less than 5% loss in accuracy and muzzle velocity
- Varied gas piston component lengths and gas port location on all barrel lengths allow for flexibility in system including an 8 VSBR
- Replaced by armorer in less than 2 minutes without tools
- Headspace automatically fixed upon reinstallation
- Chamber and bore go through a unique surface conversion process that is twice as hard and 3 times as lubricious as hard chrome
- Two piece bolt carrier has increased flexibility over one piece design
- Enlarged tail end of bolt carrier to eliminate carrier tilt
- No spring loaded firing pin and firing pin safety that unnecessarily complicates a proven 50 year old design
- Limited possibility of slam fires and drop induced discharges through a proven 50 year old design
- Improved Bolt Design with the ACB
- Extractor does not require removal for cleaning
- Fully supported bolt face (ACB)
- Refined locking lugs (ACB)
- No gas rings required
- Over-The-Beach capability
- Drainage hole in the buffer tube
- Hammer Forged barrel and proprietary internal chamber and barrel mods/dimensions designed to withstand extreme pressure during OTB operation
Improved buffer and buffer spring
- H2 Tungsten weight buffer and 20% stronger buffer spring help improve function by preventing light primer strikes and eliminating bolt bounce
- Four quadrant picatinny rail system
- No loss in zero after removal and reinstallation
- 90% parts commonality with legacy weapon systems
- Same height 12 oclock rail as legacy weapons allows 100% compatibility with legacy accessories and mounting systems
- Reduced weight; some configurations weigh a full pound less than comparable piston guns
- Available in SOCOM Flat Dark Earth or Black
- Excellent customer service
- Lifetime Warranty
These are just a few of the many features the LWRC has that make it a superior weapon. Don't forget it's been combat proven and exhaustively tested by some of the finest military units in the world. Another thanks to Darren, Jesse, Jason, and other employees at LWRC for the information provided.
Sorry for the long post, but if you ask me, I'd suggest going with the LWRC over the HK.
And a bit 'o piston porn.