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KE Arms KP-15 and Linear Vibration Welding

Those of us who have used CAV-15 lowers and had great results, were excited to see the concept reborn as the KP-15 from KE Arms. As great as the CAV-15 was, it was not without potential weak points including a small number of lowers that split at the weld between the two halves.

This CAV-15 issue is overblown to some extent but not without founding. It has also been projected onto the KP-15 for understandable reasons given the similarity of the concepts. However, it should be pointed it out that the KP-15 is not simply a rework of the original CAV-15 molds. It is an entirely new, ground-up effort – new engineering, new design, and new processes.

KE Arms recently shared a production process photo of a KP-15 lower that shows an example of how the KP-15 was designed with the process of linear vibration welding from the start with input from engineers that specialize in that process. The image shows an alignment tab that ensures that the process works as intended and can then be removed via machining after the process is complete. The result is a weld between the halves of the lower that has shown itself to be stronger than the surrounding material in testing.


KE Arms KP-15 Trap Door Buttplate

KE Arms is now offering a Trap Door Buttplate for the KP-15 lower receiver. It is available as an option for new KP-15 orders or it can be purchased separately for installation by the end-user for current KP-15 owners. Installation is easy with only a little bit of mold flashing to remove and two screws to install.

Once installed, the Trap Door Buttplate allows easy access to the storage area inside the KP-15 stock. The compartment cover can be opened easily without tools thanks to a large recessed tab.


Echo Nine Three Custom Shortened KP-15 Lowers

If you have been following this blog for a while, you’ll know I have a long-time love affair with CAV-15 lowers. One of my lowers was worked over by Echo Nine Three with a number of modifications, the most prominent of which is the shortening of the buttstock. Now that the KE Arms KP-15 lowers are out in the wild, it is becoming clear that these are a vast improvement over their distant relative the CAV-15 and Echo Nine Three is, once again, offering customizations.

The KP-15, like the CAV-15 before it, has an integral A1 length stock but the actual internal bore for the buffer tube is made to accept carbine buffers and springs. This means that there are potentially a few inches of stock that can be removed if the user desires something shorter. Echo Nine Three removes this excess length and fits a new rubber butt pad that is shaped to fit the KP-15 stock contours.

Echo Nine Three is the only gunsmith that is authorized by KE Arms to shorten the buttstock in this way. If Echo Nine Three performs the mod, your KP-15 warranty will still be intact.



Patch Collecting: KP-15 Operator Patches at KE Arms

KE Arms is churning out KP-15s as fast as possible and they are already in the hands of tons of expectant shooters. Now, you can pick up a little bit of swag to go with your KP-15 in the form of new KP-15 Operator patches from KE Arms. The patch is available with three different themes individually or as a three-pack.


KE Arms KP-15 Progress

The KE Arms KP-15 is the spiritual successor to the CAV-15 polymer AR-15 lower. As a fan of CAV-15 lowers, I’m excited about the KP-15 because it has the right people in place behind the scenes – people who have been working with the original CAV-15 since its inception and who love it even more than I do.

The latest news from KE Arms, the manufacturers of the KP-15, is that test shots have taken place with the new injection molds (see the attached images). Weld testing will be next as the KP-15 moves closer and closer to production-ready.

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