Best MK18 MOD 1 Clone Parts List [Complete]

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In this ultimate build guide, we put together the best MK18 parts list for anyone building a SBR (NFA) or a pistol (non-NFA). 

For around approximately $1500, you can build a bad ass MK18 with exact parts you want, and you can also upgrade it  later.

Let's check them out...

Top 22 Parts To Make A MK18 Clone (Mod 1)

ddmk 18 with vortex uh1 gen 2

Lower Receiver

For MK18 pistol builders, voiding NFA headaches by getting a pistol brace:

Warning: Do not modify pistol brace configuration

SB tactical sba3 brace

Most receivers are made at the same factory (Contiental Machine Tool) as any others, the difference is that the brand logo determines the price you pay.

Tip: You can tell where it is made by looking at the stamp on the receiver

Please check out our upper receiver guide for more info. 

For your MK18 build, just stick with a mil-spec receiver for the best fit.

Our favorites upper & lower receivers:

VLTOR MUR upper receiver
  • Rock River Receiver
  • Aero Precision M4E1
  • Spike Tactical
  • BCM

Some has very slick billet cut design to make your MK18 stand out more than the standard A2 upper.

Upper Receiver MOD 1 Build

dd mk18 handguard with hotbutton setup

Check out MK18 weapon light configs here

Build Tools Required

ar15 loose fit barrel in upper receiver

We highly recommend using these tools to assemble the upper receiver at home, or take it to a gunsmith.

Midwest Industry Reaction Rod - It prevents receiver shear while torquing barrel nut and muzzle 

Vice Clamp (Heavy) - Holds everything in place on a work bench 

Work Bench - Must be able to handle torque (Recommend something sturdy)

1/2" Drive Torque Wrench (Ft lb) - Use to apply exact torque 

Buy Factory Rifle Options

Daniel Defense MK18

dd mk18 surefire m300 light

The Daniel Defense MK18 is the official MK18. The DD RIS II handguard rail REALLY makes rifle for what it is. 

Easiest Option - Buy a Daniel Defense MK18 factory upper and build a pistol lower.

Or purchase the factory MK18 pistol. (Local FFL Transfer Required)

DD RIS II Rail - The Real Deal!

DDmk18 upper
  • Battle proven 6 bolt bolt-up system securely attaches the handguard to the upper receiver
  • 2 piece design accepts M203 grenade launcher without additional parts
  • Seriously made for war
  • 6061 T6 aluminum, durable & lightweight
  • Free float system, increases accuracy
  • Continous top rail

MK18 Optics

zeroing mk18 elcan specterdr

The EOTech EXPS3 and ELCAN make the MK18 builds look like others you may have seen before, but there are tons of other options available to make it fit what you want.

please check out our red dot sight guide for more information.

Other MK18 Variants

MK18 Mod 3

Mk18 mod 3 upper

The MK18 MOD 3 is about having a 11.5" barrel and the MK16 rail & better suppressor performance. The US Army calls it the MK18 CQBR UGRI.

The upper is improved to prevent gas blow back in suppressed mode, the MK18 Mod 3 also comes with the PRI M84 charging handle.

Geissele MK16 10.5" rail

1:7 Twist 11.5" barrel

Surefire SOCOM 4 prong muzzle

MK12 Gas glock (.750)

MK18 MOD 0 

mk18 mod 0 upper

The MK18 Mod 0 was one of the earliest configurations based on the M4A1.

It was simply a shorter M4A1, and it features the classic KAC M4 quad rail plus the fixed A2 front sight post.

If you clone this upper just for the aesthetics, it's quite simple. You can buy affordable Aero Precision 10.5 complete upper then change the rest as you desire or build from scratch:

KAC RAS quad rail

KAC rail cover

Colt 10.5" barrel assembly or FN 10.5" barrel

FSB gas block