I have been working on the new V4.x lower since March, and it is finally completed in the form of the SL-15 V4.8. This is the third generation of my AR-15 lower designs, and has been fully redesigned since V3.1. If your wondering what is new, continue reading. But first be sure to download the files and check out the new kit!
If you ask what is new, the answer is "everything". I went over every feature of the lower, refining each as much as possible. There are a few highlights, working front to back we'll cover them.
The front take down area has been completely redesigned. The plates were broken up into plates and cheek pieces, this allowed the plates to be machined at a lower cost. I have included metal plates in the new kits. Of course, the plates can also be printed as before.
The opening to the detent pin was move off of the head side plate, and now is part of the main lower. I also changed the angle of the detent pin so that it is will not crack at the opening along the layers. This makes for a much crisper pin action and eliminates the cracking of the old front plates at the detent.
The hardware that secures the plates is the same. And this is a good point to mention the new kits and backwards compatibility. If you want to use the old kits with the new lower, you will need to source the set screw that holds the selector detent in, and then print out the new plates and cheek pieces. For those who want to upgrade to metal plates, I'm trying to find the best way to sell them and the set screw at cost to existing customers. I'll update you one that.
The magazine catch slot and the mag well profiles were both refined. This should reduce issues with tight mags, and insure the mag catch is a perfect fit without being too loose.
The bolt hold open slot was also redesigned. The pad the supports the bolt catch extended and adjusted, so that now the catch is a perfect fit without the unneeded wiggle that we had before.
And while we're on the bolt catch area, check out how the pin is removed. There is no hole to the rear on the outside of the lower as we had on earlier versions. Instead there is a passage that leads to the inside of the fire control group pocket. Works great, is stronger, and looks way better.
You might also notice a small gap on the forward bolt catch support lug, this is no layer crack. Instead of using a split pin and expecting it to be compressed inside of the soft plastic, I know use a solid dowel pin and the plastic expands around the pin. This eliminates issues with cracking and works much better.
The integrated grip is one of the largest changes to the lower. This resulted in much better ergonomics, and eliminated the weak pistol grip connection area. The downside is that you will be unable to use your grip of choice, but STEP files have been provided for those who want to play with there own grip remixes.
But give the grip a try first, it's pretty good ;)
The only two features that have really been retained are the hose clamp and bushings. Though the recommended position of the hose clamp has been updated.
You can also see the pocket that allows the rim of a shell to remove the rear take down pin. Best part about this is it works with most cartridges, regardless of bullet type.
The thickness of the buffer tower was reduced by 0.025", and the shape of the buffer tower was updated. The result is that the older V1.8 AR-15 single rib stock adapter will not work, I'll be releasing the new V1.8.B stock adapter for those of you who want to use the Gen 3 Stock. Stay tuned for that.
Also, a release video will be out on YouTube soon. Stay tuned!
Oh, and a quick note about torrents. If you've never heard of them before, a torrent is a robust peer to peer file sharing system. With the concerns about the long term viability of Odysee, I have begun to torrent my releases. You will find the torrents hash below the link to Odysee on the release page on our website.
The hash is basically an address that you use to retrieve the information from other torrenting servers. You will need a torrenting server yourself to access the data. Fortunately this is no harder than installing a new web browser, except the torrent server is called a client. There are a number of open source options, I recommend qBittorrent.
Many of you may not know this, but I am active on Instagram, Twitter, Rumble, and Odysee, as well as YouTube. Be sure to check out my pages!