Dozens of manufacturers, including CMMG, have embraced this open-source technology, and it is taking the gun universe by storm at the moment.

KeyMod employs a keyhole-type system on the mounting surface (such as a rail) whereby accessories such as lights and lasers can be mounted without the use of tools if they have a KeyMod nut designed to fit in these “keyholes.” The primary benefit is reduced weight through eliminating un-utilized Picatinny rail interface (which extrudes from the mounting surfaces), and a more ergonomic surface as it is ‘toothless,’ unlike Picatinny rail.

The 15-inch CMMG RKM15 free-floating handguard with KeyMod.įirst, a word on KeyMod for those of you who are unfamiliar with this relatively new technology: KeyMod is a proposed replacement for the MIL-STD-1913 interface, sometimes referred to as “Picatinny rail.” In other words, KeyMod – the product of a VLTOR/Noveske collaboration – was designed to replace the traditional Picatinny rail system that has been found on most AR systems since the late nineties. The trigger is a standard, single stage GI-style, and the Mk3 lower is outfitted with a standard A2 pistol grip. The castle nut is not staked on the collapsible stock versions of the Mk3.

A Google search for “ AR-10 versus LR-308” will fill in the informational gaps and likely provide you with enough material to make an informed decision.īack to the rifle at hand, CMMG describes the Mk3 as “The perfect 308 WIN rifle for the tree stand or target range.” The Mk3 employs an 18″ 416 stainless steel heavy taper barrel with a 1:10 twist, a CMMG RKM15 KeyMod handguard and an A1 length fixed butt stock. User “TaylorWSO” at has a good post on the fundamental variations, although the information may be somewhat dated, being a post from 2008. 308 AR-style rifles, and accordingly, it may help to do some research on the matter before investing in a. This is emphasized because some readers may not appreciate that there are several varieties of. My research indicates that street price has hit as low as $1,100 on some variations of the Mk3 (complete rifle), however. The subject of this review is the base model Mk3, with an MSRP of $1,599 (the upper by itself is MSRP’d at $999). 308 Mk3 line over the past few years, and now makes a half-dozen varieties of the Mk3 in varying configurations, ranging from $1,600 to $2,000 MSRP. Each of their rifles is made in the USA and is protected by a lifetime warranty.ĬMMG introduced and developed its. Starting with barrels and uppers exclusively, CMMG now manufactures complete rifles under its own name, and has been doing so since 2005 – nearly ten years.

Central Missouri Machine Guns, more commonly known as CMMG, started as a print shop in the early aughts before heading down the path to become one of the most well-known AR manufacturers in the industry.

Cmmg keymod accessories