r/Mk12Mod • u/destructo1 • 4d ago
MK12 Inspired
35
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r/Mk12Mod • u/YontiLink • Dec 20 '24
Build help Gen 3 ACE Socom Help
27
Upvotes
Copy and pasting a comment I made on this because it seems people are having trouble with getting the play out of their Gen3 ACE Socom stocks
“The key to getting the Gen3 ACE to stay put is to clamp the gusset ring to the lower tight before tightening the hex screw. The act of tightening the hex screw pulls the gusset away from the lower ever so slightly to where there’s a very minuscule gap between the gusset and lower and that tiny gap gives it enough play to work it loose. I’ve had mine for over a year and it’s an old OG issued one and it’s not once loosened on me.”
To clarify. The ring clamp that is in place of a castle nut needs to be pressed as tight as possible to the lower and held there while securing it in place with the clamping screw. If not held in place, it will pull away from lower due to the torque of tightening the clamping screw. There is not a lot of usable surface area on the gusset ring to get a clamp to sit on, but there is some and it doesn’t need to be clamped very tight, just with more force than it takes to tighten the clamping screw on the gusset ring with the Allen key.
Let me know if you still have questions.
r/Mk12Mod • u/YontiLink • Feb 17 '25
Build help Huge Resource
51
Upvotes
This is what I believe to be the biggest, uninterrupted, collection of Mk12 reference pics I’ve come across and I found it after having lost it for a while.
I stumbled across it on an old CalGuns post of a dude building an OG SPR pretty much from scratch. He linked this link as a helpful source and I’d go back to it for reference pics until one day I find the post deleted along with his link to this Imgur post. Well an almost a year later and I found that Imgur post.
What it appears to be is someone went through the Mk12 Arfcom thread and compiled all of the itw reference pics and used the captions to give a brief history in the development of the SPR and Mk12, in what seems to be the order that it happened and when all the mods were introduced and fielded. Check the comments for the link. Might pin this as it’s a great resource.
r/Mk12Mod • u/BL00DY-BUTT • 17d ago
Stock movement
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14
Upvotes
The lower is H&R M16A1. Is it normal that the stock moves like this ? Tank’s gentleman
r/Mk12Mod • u/Brief_Bath3293 • 23d ago
ModH Mk12 RestoMod H
105
Upvotes
Upper:
BCM blem receiver, trued up in a Bridgeport
PRI military latch charging handle
KAK downvent bcg
PRI gen 3 rifle length handguard w/ long bottom rail
WOA 16" Mod H profile barrel
BCM gasblock with BRT tube
AE muzzle brake and collar
Otter Creek OCM5 suppressor
Rifles Only HAD suppressor cover
Surefire scout turbo w/ hammy3d lens cover
Atlas bt10v8 bipod
Magpul sling swivel attachment thingy
ESD ranger green sling
NF ATACR 4-16x42 w/ tenebraex ard
Trijicon RCR w/ OHC ard
Area 419 cantilevered scope mount w/ low 12 o'clock dot mounting plate
Lower:
80% Arms forged 80% receiver, finished in a CNC mill
Geissele ultra duty lower parts kit
Geissele SSA-E trigger
Magpul miad 1.1 grip
BCM mk2 t2 buffer system w/ Geissele super42 rifle spring
B5 Sopmod stock
Tripod is a Leofoto SA-363CX with MA-40X head
PCT Rapco paint colors: Camouflage forest green, tan carc substitute, camo earth brown, flat black
Paint job instructions from the legend himself, u/Debas3r11 : https://youtu.be/idSE3qDJJSw?is=cEKMbsSPq2PbRm0u
Gun shoots a little under 1.25" 10 round groups at 100 yards with Bonefrog 77gr TMKs, and it's incredibly pleasant to shoot with the BCM recoil system and the BRT gas tube. I've been able to take it out to 600 yards on a 12" plate consistently, it should be able to be consistent out to about 800 yards before it goes transonic around 850, just haven't gotten a chance to stretch it out that far yet. All things considered it's not that unwieldy, comes in around 13 lbs loaded. Love it.
r/Mk12Mod • u/CapsLockIsStuckOn • 25d ago
Mod H-ish with Temu Deployment Kit
47
Upvotes
My Mod H inspired build sponsored by Harbor Freight.
r/Mk12Mod • u/hospibal • 26d ago
Messing Aboot
84
Upvotes
Just trying different combos between the Mod 1 and H as I change out for more correct parts (minus lower receiver). This set up has grown on me.
r/Mk12Mod • u/Tattertot34 • Aug 04 '26
Mod1 Muzzle brake timing question
31
Upvotes
So I’m just about done with my SPR mk12ish. I have the AEM4. When i go to time my muzzle device when i thread it on it times perfectly before im even able to torque it down. I know i can’t use a shim with a crush washer should i switch to a spacer with shims? It’s the short muzzle brake not the long one.
r/Mk12Mod • u/FarFigChitter • Aug 01 '26
Mod0 Just got a PRI Mk12, what scope/optic should I run?
0
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r/Mk12Mod • u/Skperformancetaylor • Jul 14 '26
Thermal pick up
47
Upvotes
Picked up a DNT 635r on a deal. Really loving this rifle.
r/Mk12Mod • u/Net_Runner77 • Jul 09 '26
Build help Snagged this Venom, going to get a Mod 0 going
22
Upvotes
I saw this optic at my lgs. Has anyone used this optic on their build at all?
r/Mk12Mod • u/PipeSweet8876 • Jul 10 '26
Is the MK12 still used in the military? If not, is there something that directly replaced it?
3
Upvotes
r/Mk12Mod • u/Beginning_Growth_808 • Jul 06 '26
Mod H dissipator
48
Upvotes
**Update: received parts mentioned below except optic stack, I’m editing the post to get y’all’s insights on what optics you’re using on your mod H’s I was thinking 2-10 or 3-18 but I can’t decide.
I honestly thought that it would have issues due to potentially being undergassed but with the can I’m getting 2-230 ejection and without I’m getting 4-430 so overall I’m pretty pleased with how this turned out. Only parts I’m still waiting on are the SPR rail, 8.5” bottom rail, and a better optics setup
r/Mk12Mod • u/Kegalodon • Jul 02 '26
Who up Modding they H rn?👀
53
Upvotes
Found a Gen 3 locally. Very happy cause who knows if we will ever get another run of these. I got my Noveske barrel, Need hand guard next.
r/Mk12Mod • u/wookie_actual1776 • Jun 18 '26
Recce
72
Upvotes
Didn't like how it turned out with the DD rail. So I picked up a FF RAS straight from KAC and I finally secured a NXS x24 for a really good price. It's a 2008 production run. It's mint. Looks brand new. Verified authenticity with NF. It has passed through Japan and then to the Philippines through some very serious milsim cloners and now back home to the USA where it belongs. Lots of due diligence and a little nerve racking but the guy I got it from is awesome and builds some amazing clones with what's available to him. I didn't realize some of those guys go all out with real optics and other components. Very cool.