Intel

Whats with the acronyms?

LMT Defense routinely uses acronyms to describe or categorize our products. Sometimes these can be confusing. Here is a quick guide to help you with your next LMT purchase!

 

LMT: Lewis Machine & Tool – Our company name. Founded in 1980, Karl Lewis set up a machine shop dedicated to designing and manufacturing quality upgrade and replacement parts for a number of weapon systems, chielfy the AR-15 and M4/M16 weapon systems in use by the US Military, Law Enforcement, and civilians alike.

MRP: Monolithic Rail Platform – The MRP is one of our most popular patented designs that changed the nature of the AR platform. The MRP is a one piece upper receiver and handguard forend that allows for quick changing of our proprietary barrels. We now utilize this receiver system on the majority of our rifles and carbines. The MRP is available in two lengths on the 5.56 base platform and one on the 7.62 base platform. Also we offer our patented upper in 3 variations of rail, quad rail, LM8 and MLOK.

MWS: Modular Weapon System – The Modular Weapon system is the acronym given to our 7.62 base platform. Released in 2009, the MWS came chambered in 7.62 Nato and 5 other calibers including 6.5 Creedmoor. The most recent development of the MWS was the addition to the MARS family in with the MARS-H series of rifles. The MWS is now utilized across the world in countries like the UK as the L129A1 DMR rifle and New Zealand.

MARS: Modular Ambidextrous Rifle System – The MARS rifle started its life with our contract with the New Zealand Defence Force. The MARS-L (L for Light) features an ambidextrous bolt catch and mag release. The safety on the MARS is also ambi. This contract requirement became a staple for LMT and now we offer it across our product lines to include the MARS-H (H for Heavy) platforms on our MWS. The MARS lower configuration is so natural to operate, it will make you wonder if that was the way the creators of the AR weapon system intended it to be.

VBS: Virtual Baffle System – The VBS is one of our newest additions to the LMT product line-up. We are very excited to announce that LMT has its own line of suppressors made with technology direct from the Lawrence Livermore National Laboratory. These suppressors are unlike traditional cans you’ve utilized. Our suppressors are specifically designed to mitigate the report of the rifle at the shooter while reducing environment disruption, thermal build up and most importantly, gas blow back to the shooter. This last feature is a common issue that many simple suppressors cant avoid due to the nature of pressure build up. Because of this lack of pressure, our equipment doesn’t require special modifications to run in a suppressed or un-suppressed configurations.

CSW: Confined Space Weapon – The CSW is a unique and exciting weapon platform. Based off our MARS-L platform, the CSW shoots 300BO through an integrally suppressed barrel hidden under a specifically made LM8 MRP upper receiver. Using or VBS technology allows us to make a very quiet, compact, and reliable battle rifle. Offer in semi-auto and select fire, this SBR is a formidable contender as the go to choice for operators who need big results in a small package.

CQB: Close Quarters Battle – CQB is common terminology in the defense industry to refer to a situation where a shooter experiences confine proximity to targets or his/her environment. We use the CQB acronym to describe our original 16″ barrel, short handguard MRP carbine. We also use CQB to refer to anything in the 5.56 base platform that is configured in quad rail.

LM308: Lewis Machine 308 – The LM308 is the original designation given to LMT’s original heavy MSR. Released in 2009 with 5 accompanying calibers, quad rail monolithic upper, ambidextrous mag release and two stage trigger, the LM308 has grown to be one of our most popular platform for sportsmen and designated marksmen alike.

LM8: Lewis Machine Eight – LM8 is the designation we use for our proprietary handguard style. This rail system used on both the 5.56 and 7.62 platforms, creates a bomb proof mating system between the picatinny rail section and the forend. The user chooses one of several rail lengths and attaches the rail to the forend utilizing machine screws. Male and female locating point prevent lateral movement of the rail even if the hardware should become loose.

MLOK: MLOK – This one is pretty easy. You may have seen the term MLOK thrown around in the industry through your product searches. Magpul Industries developed MLOK as a reliable, sturdy, field expedient way to attach a rail section to your weapons forend. MLOK has quickly become an industry standard. We offer this configuration for both our MWS and MRP/CQB platforms.

SLK: Slick – Another acronym we commonly use when describing the LM8 platform for bothe the MRP and MWS systems.

SPM: Standard Patrol Rifle – The standard patrol rifle is LMT’s base rifle. These platforms are commonly known as M4 variant rifles. Made to mil-specs with LMT’s added attention to detail, these are quintessential AR’s ready for the patriot, law enforcement officer, or war fighter.

STD: Standard – The STD is LMT’s take on the M4 with upgraded features like the SOPMOD stock, our two stage trigger, and QD end plate.

MLC/MLR: MLOK Carbine/MLOK Rifle – These two designations are used when describing our MRP platforms in the MLOK variety. The MLC refers to the shorter carbine handguard length upper where the MLR refers to the longer version in the rifle platform.

MLK: MLOK – Another abbreviation of the industry standard MLOK pattern this time used on our MWS platform as we currently have only the one length forend.

SOPMOD: Special Operations Peculiar MODification – It’s no surprise that we work closely with the US Government on many projects. One such project that dates back to the late 90’s is the LMT SOPMOD stock developed for the ever growing need to customize and modify weapons platforms for our front line war fighters.

PDW: Personal Defense Weapon – We typically use the PDW acronym to describe carbines and SBR’s with our compact SOPMOD buttstock kit. This stock was designed for those wearing bulky body armor or utilizing our weapons in situations where space to maneuver the weapon is at a minimum. Our PDW stock kit will work on nearly every variation of AR15.

MSR: Modern Sporting Rifle – We use this term generally to refer to the commercial class of semi-auto weapons that retain the performance and durability specifications set by the worlds best fighting force, the US Military, yet do not have select fire capabilities and are not assault weapons or machine guns.

762X51 Nato or 308 Win in my MWS?

Good news! You can shoot both NATO 762 and commercial grade 308 Win through your MWS rifle. The commercial spec ammo actually runs slightly higher pressures over the 7.62X51. However we build our barrels to withstand greater pressure than either calibers produce. However we do NOT recommend use of hand loaded ammo in either caliber.

Are LMT Defense barrels CHF (Cold Hammer Forged)?

No, LMT barrels are not cold hammer forged. Commonly confused with CHF, is our cryogenic stress relieving process. This is done on all barrels, both chrome-moly and stainless.

What are the advantages of the Enhanced Bolt Carrier Group?

The LMT Enhanced BCG has many features to cure or improve common issues on the AR-15 type weapon system. See below the list of features and advantages to using the Enhanced Bolt Carrier Group.

  • Enhanced “Lobster Tail” extractor: This unique extra extractor utilizes two specific springs vs one standard spring to provide a very positive capture on the rim of the case.
  • Enhanced bolt lugs: Our specifically cut bolt reduces impact shock and wear on the lugs themselves while improving their strength. You’ll notice one lug, opposite of the extractor, is cut intentionally as to not present a bias on one side due to placement of the extractor.
  • Proprietary coating: Our bolt features a coating that reduces wear, increases lubricity, and helps decrease maintenance time.
  • Elongated cam path: The elongated cam path allows the bolt to remain locked in battery for a slightly longer duration of time maximizing the efficiency of the gas system and presenting less blow back to the shooter.
  • More gas ejection ports: The enhanced carrier features additional gas ejection ports to quickly disperse any excess gas not necessary to the cycle of the weapon system. This feature also reduces gas blow back to the shooter.
  • Reduced surface carrier rails: These rails reduce friction on the upper receiver, improve lubricity by allowing oil to travel in between the contact patches and allow a gap for debris to move away from building up on the carrier body.

How do I buy an SBR(Rifle with a barrel less than 16″)?

Short barreled rifles are currently legal in 43 states. Some states or local areas may have different restrictions on SBR’s, so you should check with local laws prior to making purchases. If you are interested in purchasing an SBR, you should follow these general guidlines:

  • Find a local Class 3 dealer. If you do not know if your dealer sells NFA items, ask them if they handle such purchases or if they suggest another local dealer.
  • Once you’ve made contact with an approved dealer, you’ll need to select and purchase an SBR (we highly suggest an LMT PDW). You will not be able to take possession until after the transfer is complete.
  • The dealer should assist you with the Form 4 process of an NFA transfer. The process includes filling out the Form 4 documents for a weapon already in the NFA registry, visiting your local chief law enforcement officer (CLEO) or local police chief, obtaining completed finger print cards, a and check for $200(your NFA tax stamp.) The dealer should be familiar with this local process and will be able to assist you. You will need the following:
    • Completed Form 5330.20
    • Two fingerprint cards
    • Two passport photos
    • $200 check made payable to the Bureau of Alcohol, Tobacco, Firearms, and Explosives
    • Both copies of your completed Form 4’s
  • Once you have everything you need to submit a Form 4 transfer send it all in to the ATF and wait. This wait may be 6 months or more as purchasing SBR’s and suppressors has grown greatly among American marksmen and shooting enthusiasts. SBR’s  and suppressors greatly enhanced the shooting experience and is highly worth the wait.

Another option is to Form 1 or manufacture an SBR. This process is a little more lengthy and involves the individual creating their own SBR from a non-restricted firearm. We highly suggest that if you choose to Form 1 an SBR that you seek the guidance of a local class 3 dealer.

How do I buy a suppressor?

Suppressors are currently legal in 42 states. If you are interested in purchasing a suppressor, you should follow these general guidlines:

  • Find a local Class 3 dealer. If you do not know if your dealer sells NFA items, ask them if they handle such purchases or if they suggest another local dealer.
  • Once you’ve made contact with an approved dealer, you’ll need to select and purchase a suppressor (we highly suggest an LMT VBS). You will not be able to take possession of your suppressor until the transfer process is complete.
  • The dealer should assist you with the Form 4 process of an NFA transfer. The process includes filling out the Form 4 documents, visiting your local chief law enforcement officer (CLEO) or local police chief, obtaining completed finger print cards, and a check for $200(your NFA tax stamp). The dealer should be familiar with this local process and will be able to assist you. You will need the following:
    • Completed Form 5330.20
    • Two fingerprint cards
    • Two passport photos
    • $200 check made payable to the Bureau of Alcohol, Tobacco, Firearms, and Explosives
    • Both copies of your completed Form 4’s
  • Once you have everything you need to submit a Form 4 transfer send it all in to the ATF and wait. This wait may be 6 months or more as purchasing suppressors has grown greatly among American marksmen and shooting enthusiasts. Suppressors greatly enhanced the shooting experience and is highly worth the wait.

What parts can I use to build my MWS?

The LMT MWS is one of the leaders in the commercial AR-10 market. One big feature that sets our weapons apart is the ability to quickly change barrel types and calibers while maintaining less that 1 MOA shift. Typically AR type weapons are plug and play thanks to the US DOD and industry standard of specifications. The “AR-10” family of rifle does not follow a specific industry standard. While our MWS is a true SR-25 pattern and will work with Knights Armament equipment, we highly suggest to avoid any issues derived from a stack up of tolerances, you only use LMT certified parts when building your heavy gun.

What is the life expectancy of LMT Defense barrels?

There is no set barrel life or round count for our barrels. Heat is the enemy of steel. Depending on how hot you get your barrel, and for how long that temperature is sustained, can have great affect the life of a barrel. Barrel material like stainless steel and chromoly with a chrome lining are affected differently. The last factor that can affect barrel life is maintenance or care and bullet type. Maintaining your equipment is crucial to longevity, the bore of a rifle is no exception. Different types of bullets and jackets interact differently with the rifling, make sure to use proper maintenance for your particular ammo.

 

What barrels are compatible?

MRP (5.56/.223) and MWS (7.62/.308) platforms are independent of one another. LMT barrels made for the monolithic platforms are proprietary.  While all MWS barrels are compatible with that platform, the MRP hosts two upper receiver lengths, each with their own capabilities.  HERE is a chart displaying upper/barrel compatibili

What wrench/settings are used to change an MRP/MWS barrel?

MRP/MWS locking screws use a T-30 head and should be torqued to 140 in/lbs for optimum performance.  The LMT Torque Wrench is designed to this exact specification.  Need a tutorial?  Check out our video on YouTube!

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