Craddock RTR 223 Wylde 16.25” Build

WeR0206 · Jun 20, 2025

Figured I’d start a thread for a new build I’m working on. It will be based on a bead blasted RTR .223 Wylde 16.25" Mk12 Mod-H barrel with headspaced bolt & set screw gas block, SOLGW M89 13” rail, Lantac Billet upper (thermofit), Lantac enhanced bolt carrier, BCM MK2 ambi CH.

I’ll being using a different muzzle device than the one in the below pic. Currently waiting on a Cross Machine Tool Tactical Combat Flash Comp. Will update the thread as I put it together and load up some 77 smk’s for it in some ‘25 LC brass with a variety of powders.

I will likely pair it with an aero m4e1 lower with geissele ssa-e x trigger, FCD safety, maritime bolt catch/release, geissele super42 buffer spring (h2 buffer), Magpul k2+ grip, and magpul dt-pr stock.

thedude824 · Jun 21, 2025

If you want an easy button, 24.1 grains of N140, 77 SMK, in new lake city cases has been sub MOA in every single AR I’ve tried. Colt HBAR, Criterion Core, Criterion Hybrid, and whatever BG Defense uses in their Type A. I wanted to try TAC, but with load development on several different guns going I just can’t justify the time. Especially given the cost of N140. I need to chrono it next time I shoot 556.
Cool looking build. I’ve got 3 RTR barrels now (all 6.5 Grendel) and I’ve been very happy.

WeR0206 · Jun 22, 2025

thedude824 said:
If you want an easy button, 24.1 grains of N140, 77 SMK, in new lake city cases has been sub MOA in every single AR I’ve tried. Colt HBAR, Criterion Core, Criterion Hybrid, and whatever BG Defense uses in their Type A. I wanted to try TAC, but with load development on several different guns going I just can’t justify the time. Especially given the cost of N140. I need to chrono it next time I shoot 556.
Cool looking build. I’ve got 3 RTR barrels now (all 6.5 Grendel) and I’ve been very happy.

Thanks! Oh yes Im quite familiar with that combo, prob shot my best gas gun group ever with it. N140 will be at the top of my list to test out accuracy loads along with 8208 xbr and maybe H4895. For speed & blaster loads I will use tac or AA2520. I will post my ladder tests, etc here.

WeR0206 · Jun 23, 2025

Finally got the new barrel borescoped today. Everthing looks pretty normal to me except I've never seend lands that start "unevenly" like this before (see first pic below). I'm not going to judge the barrel until I shoot it but I wanted to make a note of that.

This is a mid-length gas system and the port gauged out to 0.079"

Now that the initial barrel inspection is complete I will start breaking it in then start load development.

Start of rifling/lands:

mid part:

Gas port:

Crown pic 1:

Crown pic2:

WeR0206 · Jul 14, 2025

Finally got the parts I was waiting for but I cant torque my barrel nut down bc my midwest URR won’t fit in the lantac billet upper. I just ordered a magpul bev block and I should be able to use that so I can torque the nut and go from there.

jLorenzo · Jul 15, 2025

Interested to see how it shoots

WeR0206 · Jul 17, 2025

Got the bev block today and put everything together. Next steps, do a function check with some factory ammo then start breaking in the barrel and working up some handloads with 77 smk’s.

VargmatII · Friday at 12:59 AM

When will the "Mk12 mod H" parts start showing up?
As there is NOTHING "mod H" going on about that build, as it is... A barrel profile does not mean much...

This is what a Mk12 mod H looks like:

https://www.aesuppressors.com/wp-content/uploads/2023/10/MK12-Mod-H.jpg

WeR0206 · Friday at 1:03 AM

VargmatII said:
When will the "Mk12 mod H" parts start showing up?
As there is NOTHING "mod H" going on about that build, as it is...

Lol…sorry for the confusion. The mk12 mod-h was referring to the Craddock RTR barrel model. I removed the mk12 mod-H from the thread title to avoid further confusion

JR1200W3 · Friday at 11:20 AM

WeR0206 said:
Lol…sorry for the confusion. The mk12 mod-h was referring to the Craddock RTR barrel model. I removed the mk12 mod-H from the thread title to avoid further confusion

Lol, you just got criticized by a socialist on how unauthentic your classic American Apple Pie SPR style build is.

VargmatII · Friday at 11:25 AM

JR1200W3 said:
Lol, you just got criticized by a socialist on how unauthentic your classic American Apple Pie SPR style build is.

Who is a socialist?

I am somewhat of a Mk12 nerd, thats for sure though.

JR1200W3 · Friday at 11:37 AM

VargmatII said:
Who is a socialist?

Jsp556 · Friday at 2:39 PM

Looks good. That gas port size is…..

fedupflyer · Friday at 2:48 PM

jLorenzo said:
Interested to see how it shoots

Mine shoots 0.6 MOA with FGM 77g
Mod H profile 7.7 twist.

WeR0206 · Tuesday at 1:50 PM

Just got a new borescope that has a focus feature on it and took another look down the barrel to validation gas port alignment (it's slightly off but I'm gonna run it) and I noticed this barrel has some pretty rough looking machining marks. It also has a ton of what looks like cooper or possibly rust deposits between the gas port area and the muzzle even though I have never shot it.

I will still try this barrel out but I wasn't expecting to see tons of brown stain looking things inside unless its from them test firing (I cleaned the barrel thoroughly with eliminator followed by some iso alcohol before looking with my new borescope and I didn't really see blue color on my patches).

I will be done with my handloads for this upper soon and hopefully get to the range within next few days.

Is this copper or rust?

Jsp556 · Tuesday at 2:45 PM

No clue about the discoloration but I’d put the bore scope away and shoot it before I got it in my head that the barrel was no good before I even shot it. Forgive the run on sentence. Lol

Both my RTR Grendel barrels shoot good.

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