Machined a Custom "Plan B" Type Suppressor Mount

[Vernonia MW]

Hey dudes.

I just finished a pretty neat part for a customer. He had a Yugoslavian M59/66 SKS that he wanted to suppress. Our ideas went through several stages, but we ended up deciding to make an entire new Plan B compatible muzzle device from pre-hard 4140 chrome moly steel.

This new device would be threaded M14x1 RH, with a face mount design such that the barrel crown would be controlling suppressor alignment (not the shoulder of the threads). I started on the Prototrak TRL 1440. The outside profile with the 25° taper and the .900"x24TPI threads was turned at the same time as creating the M14 internal threads. This would ensure alignment between the suppressor mounting features and the face mount features. An ID groove was added to serve as a thread relief for the M14 threads.

Second OP was pretty straightforward. I just moved over the the LeBlond Dual Drive engine lathe, chucked the device in a 5C collet, faced, drilled, and bored the inside of where the flash hider slots would end up.

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[Vernonia MW]

Next I would get to try the new mill. It is an Acra knee mill that was converted to 2 axis CNC with a Prototrak SLX controller. Pretty basic stuff, but it would be my first CNC mill in the shop, and this was the perfect first project for it. I started by chucking the device in a 5C hex block, wrote a quick program to do the slots, and then cut one for each side of the collet block.

I then held the device upright and cut a 3/4" hex on the back side. This would allow use of a standard armorer's wrench (or standard open end wrench) for installation and removal.

 

[Vernonia MW]

The last step was to hot blue it. I decided against media blasting and kept it polished. I like the look. It will turn matte with carbon soon enough. The fit was tested on a Plan B mount. The threads were tight, and the tapers engaged well, locking the device into the mount firmly. Unfortunately, I did not get to see it mounted to the SKS it is destined for, but I expect it will serve its owner well.

Thanks for reading!

 

[Saladfarmer]

The last step was to hot blue it. I decided against media blasting and kept it polished. I like the look. It will turn matte with carbon soon enough. The fit was tested on a Plan B mount. The threads were tight, and the tapers engaged well, locking the device into the mount firmly. Unfortunately, I did not get to see it mounted to the SKS it is destined for, but I expect it will serve its owner well.

Thanks for reading!

View attachment 2039187 View attachment 2039188

Beautiful work!

 

[Vernonia MW]

Thank you!

 

[Vernonia MW]

Customer sent me a couple pictures of it mounted up!

 

[MDDM]

Very nice. Now, get to work and make some 1X16LH mounts with CATs open source data

MUZZLE DEVICE BASE.QD.1-16 LH ACME-3G.20 DEG TAPER – Specters Cat

specterscat.com

 

[red442joe]

Great work!
Thanks for sharing!

Joe

 

[Catbox]

Nifty machine work sir!

 

[Vernonia MW]

Very nice. Now, get to work and make some 1X16LH mounts with CATs open source data

MUZZLE DEVICE BASE.QD.1-16 LH ACME-3G.20 DEG TAPER – Specters Cat

specterscat.com

Left hand ACME thread...? That's an interesting choice for a muzzle device.

 

[MDDM]

Left hand ACME thread...? That's an interesting choice for a muzzle device.

It's been absolutely perfect in my experience with it so far.

 

[TTSX]

What was the cost for a custom, one off muzzle device?

 

[Saladfarmer]

What was the cost for a custom, one off muzzle device?

hey homie, you can email him directly. it's on his website www.VernoniaMW.com
He responds very quickly. He's working on something for me right now even.
Possibly have it for the next rifle match in a couple weeks.
We'll see...

 

[Vernonia MW]

What was the cost for a custom, one off muzzle device?

This one was $250, and I don't know that I would do another for that price... lol

My shop rate is $100/hour. I do my best to structure my pricing around that. In this particular case, by the time I got done reverse engineering the Q device, programming, setting up, machining, and bluing.... I was probably closer to 5 hours than I was 2.5. That being said, I learned stuff about the new mill, I now have a program saved to make additional Plan B blanks if requested, and (most importantly) I enjoyed the process.