Let's face it. When we are building a Mk12 we want everything just right. Charlie's is here to help. Here is our short list of barrels that will work wonders for you, already coated to spec, and we have included the Mk12 barrel and the Allen Engineering long or short collar, brake and thread protector. You benefit from our research, our testing, and clone ready barrel.
Just add this setup to your clone receiver setup, or if you are looking for a specialty Mk12 inspired look, have at it. Oh, you might also need the right handguard, optic, stock, bipod and rings.
We have done the research. We have purchased a number of popular barrels and put them through the test to see if we could fit the Ops, Inc or Allen Engineering collar and brake on the barrel, and then attach the AEM-5 / Ops Inc. #12 suppressor on the barrel with collar and brake setup.
We can cut to the chase. All the barrels would accept the Mk12 gas block from either Daniel Defense or Badger Ordnance. Some took some effort, some allowed the gas block to slide right on. All would accept the Allen Engineering long or short collar and the brake with shims. But several were out of spec to accept the Allen Engineering AEM-5 suppressor. Charlies does really understand why. Ron Allen has supplied the SPR profile to any barrel maker who chooses to follow. Several brands were not in spec. Generally, this means that the measurement of the end of the threads to the shelf point where the collar attaches was not the correct distance. Now, in talking to Ron Allen, he explained that he has been seeing a number of baffle strikes in his suppressor, but upon further research, the problem was one of two things: 1) some rifle manufacturers were having the Ops Inc collars and brakes make by another vendor, or maybe they were making the brakes and collars themselves, but Ron tells us that they were not in spec, and were not Allen Engineering products. 2) the profile of the barrel was not to spec, and generally, the distance from the muzzle to the collar step was too short. This results in the suppressor making two few turns, and the alignment against the collar is not quite right, or to make it right resulting in far too much shimming and far too little of the barrel thread actually inside the suppressor.
To get the suppressor of a Mk12 / Ops Inc / AEM-5 aligned properly is a very delicate and technical task. The suppressor rests on on the collar, but then is threaded inside the suppressor onto the external threads on the brake. There is a certain number of turns that are needed for all this magic to happen and the suppressor to perfectly rest on the collar, and be securely fastened to the threads on the brake.
So, Charlies brings you the short list of barrels that perfectly fit.
If you do not need a suppressor, don't sweat it. Many barrels will fit the gas block and the Allen collar and brake. For most people, that is good enough. Also, there are some rifle and barrel brands out there that are not trying to be clone correct. In fact, one of them tells you that they have found the better secret sauce and improved upon the original Mk12 design. They are probably correct. After all, the Mk12 made its way into the battlefield in 2001, so that is a long time ago, and there are better rifles and better barrels out there than the 18" SPR barrel.
If you want to build your Mk12 to be historically, correct, then we are your huckleberry. We have shortlisted four barrels, with hardware and gray or black coating ready to go. Charlies is offering three different barrels
One note: there are a number of super great quality companies who are making barrels and uppers and rifles that are Mk12 or Mk12 inspired. Many of which, we have tested, and there are some we have not. You should not take away that if that barrel is not listed that it failed our testing. Some did. There are probably barrels, other than what we have listed that will work just fine. As we test more, we may choose to offer more. At the end of the day, we are looking for quality and adherence to the specifications that AE has given. We are comfortable with the four barrels we have listed, and stand by them. You might like another barrel. No hard feelings. We cannot sample everything, but we feel that we sampled enough of what is on the market to make some strong endorsements for the barrels listed. Could we give you three more barrels that will work just fine? Maybe, but this is a good start.
What we have listed will fit the bill for Mod0 or Mod1 builds. We have not yet addressed the Mod H or the NSW Recce. That will be another topic. The latter two versions have shorter barrels.
Enjoy with confidence.
If you are building a Mod 0, you will want to need the PRI Gen1 flip-up sights with the cross-bolt installation.
If you are building a Mod 1, you will need A Mk12 gas block, ready for you to install, either the Potomac Mk12 gas block or the Badger Ordnance Mk12 gas block or Daniel Defens Mk12 gas block.
Note: One picture shows the Mk12 gas block installed. The gas blocks are available for purchase, but not included in the base price, as Mk12 gas block is only correct for the Mod 1.
Charlie's also offers installation of the complete kit with the gas block and your barrel nut, or the entire upper receiver with your rail for an additional fee. Note that to assemble the barrel kit, we will need the barrel nut that you will be using, or you will need to buy the barrel nut from us. The barrel nut must be installed before the installation of the gas block and the collar and brake. The barrel nut is also include in the PRI or KAC rail for the Mod 0 and Mod 1 respectively. Most customers will choose to purchase the rail with the barrel if Charlie's is installing the kit, but if you have a rail, you can send us the barrel nut separately.
On pricing, some barrel kits might seem high, but keep in mind, you are getting the gas block, and the AEM muzzle kit, the barrel coating and Charlie's selection and handling, all in one place. We have invested a lot of time and inventory and research into Mk12 barrels. You can count on getting the right barrel. On delivery timing, some barrels are in stock, and others need to be made, not to order, but in batches, and also tested and coated, so plan on a good 5 weeks for your barrel delivery. Some will ship in 1 or 2 weeks, some in 5 to 8 weeks.