Everything MK 12 (SPR Proto 1, SPR Proto 2, Mk 12 Mod 0 and Mk 12 Mod 1)

[thmpr]

I will be joining the MK12 Club using knights components built by High Caliber. ETA: MAY

[FMJBT]

Very nice info bro. PRI now actually carries the 16" mk12 upper, they just call it a variant though.

They recently added the "Tactical Operator" to their lineup, which is even closer to the spec for the Mod H. Note that under the "features" tab, the Ops Inc can be added to this upper as an option:

https://www.precisionreflex.com/Detail.aspx?PROD=756083&CAT=4824

I've also hear rumors to the effect that PRI will be doing a limited run of old school Mod 0 parts sometime in the next few months, including the older Gen I/II forearms, thumb wheel adjustable front sight gas block and ARMS style PEQ rail.

[GSG-9]

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[kalieracer]

Man I feel left out..

I have MK12 Mod1

LMT Lower with sopmod
KAC 2stage trigger
KAC FF RAS
KAC front and rear BUIS
Douglas Mk12 barrel
LMT upper
LMT BCG
Ops inc brake and collar.

[CLOUT]

Finally…Complete.

My MK12 Mod 0 SPR Build

LMT Upper
18" Douglas SPR contract barrel
LMT Enhanced F/A Bolt Carrier & Bolt
OPS Inc 12th Model Muzzle Brake & Collar
PRI Gen III Handguard
PRI SPR PEQ Rail
Leupold Mark 4 3.5-10x40 LR/T M3 Illuminated TMR
A.R.M.S #22 QR Medium Rings
PRI Flip front sight
A.R.M.S. #40 Rear Sight
Harris 6-9 SBRM Bipod and A.R.M.S. #32 QR Mount
LMT Tactical Charging Handle
LMT Defender Lower
LMT A2 Stock
Sierra Precision SPR Grip
Geissele SSA-E Trigger
Raddlock Bullet button
ASC 10/20 Mag w/ Magpul USGI Ranger Plate

[Pryde]

All correct Mk12 Mod1 parts:
Douglas stainless SPR barrel turned by Compass Lake
Colt upper and internals, Nodakspud NDSA1 black lower
KAC rail, sights, bipod mount, trigger
A1 stock and grip
Small Calico Cat

[Calgunner217]

Here's my MK12 MOD1.

upper; Centurion Arms MK12 MOD1, Knight's fr/rr BUIS, A.R.M.S. scope rings, Leupold MK4 3.5-10x40 LR/T Illum. Ret., Knight's bipod adapter, Harris BiPod S-BRM 6-9in, Harris bipod podloc.

lower: Custom Rollmark Lauer Custom Weaponry OLL, JP lower parts kit, Radlock, Knight's two stage trigger, Tango Down BG17 grip, A2 buttstock.

[ct1222]

Hey guys, not sure if this is the right thread to ask but it is regarding the mk12 so.....

Anyways I'm kinda confused about the lower. Specifically, is it supposed to be select fire or semi-auto only? According to Wikipedia(I know....Wikipedia....) its semi-only, but some folks over at ar15.com suggested that its select fire, being built around the A2/A1 lower and all.

The reason I'm digging so much about the mk12 is because I thought it can be reproduced to EXACTLY how the military has theirs, being semi-auto and all....

[Gutz]

Lol, had to take new pics, just finished uploading them. Finally got my forward assist, so aside from an optics upgrade at some undetermined time (Whenever my 308 upper sells ), it's about 99% complete.

Although not a true to spec MK 12 Mod 0, this one was heavily inspired by the Mod 0. Substitutions were made to add a "Delta" theme to the build, such as the forend and buttstock. The Proprietary rail for the Delta forend was substituted in place of the SPR PEQ rail, which I feel is an upgrade because it will allow easier mounting of picatinny based NV devices later on. When budget permits, I plan on adding an ATN PS-22 or PS-40 to this rifle for night shooting. Keeping in mind the low magnification requirements for those devices (6X or less), future optics will most likely be FFP design to maintain calibration of the reticle at reduced magnification.

Build Specs:
-Upper Receiver: DS Arms
-Barrel: Bergara 18" Stainless SPR contour w/ 1:8 twist (From PRI)
-Forend: Precision Reflex Gen III Delta (Rifle Length)
-BCG: R-Guns Nib coated M-16
-CH: BCM Gunfighter Mod 3 (New version designed for suppressors)
-Optics: FM Optics 4-14X44 FFP Mil Dot (Temporary)
-Mounts/Rings: PRI Gen III Delta Top Rail w/ UTG medium height QD rings
-Gas Block/FS: PRI Folding Front Sight w/ RRA Melonite gas tube
-Rear Sight: ARMS #71 folding rear sight (Polymer)
-Muzzle: Ops Inc. 12th brake and Collar assembly
-Misc: DPMS Teardrop Forward Assist.
-Pending: Noveske and PRI QD Sling Swivel mounts

-Lower Receiver: Spikes Tactical "Punisher"
-Grip: Sierra Precision
-Trigger: PSA single stage, worked over via "30 minute trigger job"
-Buttstock: MAGS EFX-A1 Fixed Stock

-Sling: Home built 2 point sling with sewn in QD swivels

Pics:

DAMN!!! That IS THE BEST LOOKING rifle I have ever seen. Job well done sir....

[Pryde]

Hey guys, not sure if this is the right thread to ask but it is regarding the mk12 so.....

Anyways I'm kinda confused about the lower. Specifically, is it supposed to be select fire or semi-auto only? According to Wikipedia(I know....Wikipedia....) its semi-only, but some folks over at ar15.com suggested that its select fire, being built around the A2/A1 lower and all.

The reason I'm digging so much about the mk12 is because I thought it can be reproduced to EXACTLY how the military has theirs, being semi-auto and all....

All lowers the military has in inventory are select fire, therefore all mk12s should be select fire.

[ct1222]

All lowers the military has in inventory are select fire, therefore all mk12s should be select fire.

Bummer.....now what to do with my spare JD lower........

[JDW67]

Damn you guys. Figured I didn't want to build any more ar15 variants until I saw this thread. Now, it looks like a MK12 build is in my future.

[Dark Sky Solutions]

Damn you guys. Figured I didn't want to build any more ar15 variants until I saw this thread. Now, it looks like a MK12 build is in my future.

Well if you are interested in a PRI MK12 Mod 0 upper please feel free to contact me via my website or PM on here. I can't get them in stock fast enough so I usually just order them from the factory and it is shipped out 5-10 days after ordered straight to your address of choice.

Good luck on your build.

[2zero9]

tag

[GSG-9]

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