Want to take your AR build game to another level? Tennessee Arms Company is proud to offer the first Hybrid 80 Percent Receiver Blank on the market, The Liberator . Using the same Nylon 6-6 with 50% fiber fill for the body and brass inserts near high stress or threaded areas , we are confident when we say that this is the best 80% on the market today, in a class all its own. Now you can have the ease of machining Nylon with the strength of our brass inserts. All covered by our lifetime warranty.
Liberator w/jig comes with a one time use jig and trigger hole guide. All you need is a drill press and the following bits to complete your 80% project which can be purchased here Drill Bits & End Mill Kit
All Liberators will be shipped to the address in the "Shipping Address" portion of the checkout process . If you have special shipment needs , please list them in the "Comments" section of the checkout process.
Return and Exchange policy: We will only accept returns and exchanges on unaltered 80% blanks. Any manufacturing defects or exchanges will be processed on a case by case basis.
I have a PSA and an LMT upper, neither of which fit this lower receiver as the buffer tube mounting point was too thick. I haven't had any issues with other lowers mating to these uppers. I'll have to sand it down to remove about a quarter to half inch of extra material that is preventing me from using this lower.
It was otherwise a very simple operation to use the jig and much more pleasant than machining aluminum.
Quality lower that's easy to mill. This lower has been very durable.
For best results mill close and finish off with a file.
Did this one free hand. Just took my time and finished up with hand files and dremel tool. Upper to lower fit was a bit snug but a little time with the hand files and everything was perfect. Hey that is part of the fun of DIY. Works and shoots great.
I bought the 80% lower (with jig) in FDE and encountered quite a few problems along the way. First up was the bottom of the jig being badly out of level, making it difficult to keep the milling vertical. I should have taken more time trying to sand it level. When I had the milling just about finished, I discovered a modest sized crack width-wise in front of the trigger hole. I don't think I caused it, but the doubt was present. Soldiering on, I found the spacing between the takedown and pivot pins was off. That required opening the holes up, which compounded the pivot pin hole already being loose enough for the pin to pop off the detent occasionally. With that done, I found I had tolerance stacking issues with the upper receiver being used for the build. The lower worked with other uppers and the upper worked with other lowers, but combining the two resulted in a charging handle that was extremely difficult to pull back unless I popped out the takedown pin and lifted the rear of the upper slightly.
I emailed TN Arms a description and emails showing the problems, but never got a response after several tries. They eventually sent a form letter for how to return the product on my dime. That didn't really appeal to me, so I showed them ... and bought another one! This time in Stealth Grey, figuring it would look better with the direction of the build, and maybe the FDE batches had all the production problems.
The Stealth Grey lower had no problems with the takedown/pivot pin spacing or the tolerance issue with the upper receiver. However, it had a similar, but not as bad, warpage of the jig bottom, and a smaller hairline crack in nearly the identical spot in the trigger pocket. I again emailed TN Arms with comparison shots and received no response. I get the feeling they simply do not answer emails, which is unfortunate when trying to provide QC feedback. The bolt catch slot is a bit too wide (0.162" vs 0.157" on the FDE lower), allowing the bolt catch to rattle around quite a bit. In machining the slot that much wider, it opens into the mag well slightly.
So, having received an invitation to review the product, I find myself torn on what rating to give it. I genuinely do like it, but with obvious reservations. The general appearance is excellent. There appears to be a flaw in the manufacturing process with regards to the trigger pocket cracks. Both lowers also had the takedown pin detent's hole too close to the inner wall, resulting in the wall flexing in when pushing the pin in and having to shave the face of the pin to clear the takedown lug. I have to take one star off simply for the lack of support. I'm probably being generous in giving the Stealth Grey lower four stars, given the modest flaws. The FDE lower gets two stars at best. So, between the two, I'm looking at a middle-of-the-road three star rating.
Miscellaneous feedback: 1) The front facing external portion of the pivot pin holes needs to be sanded down to clear any barrel nut or handguard that sits close to the upper receiver. Likewise, the front facing top/middle of the receiver extension needs sanding to clear any upper receiver. I get that they would rather have too much material than too little, but that doesn't inspire much confidence in the manufacturing tolerances when aluminum receivers have no such need for extra material. 2) Everyone is ambi-crazy these days, but lose the safety selector tabs on the right side. With the sides of the receiver extension being beefed up as they are (a good thing, given poly receivers' reputation for breaking there), the rear tab makes it very difficult to get a fingernail in there to pull a standard takedown pin. I sanded down the offending tabs. Unless you're running a selector with a reversible lever on just the right side, I see no reason to have the tabs. The safe/fire markings are sufficient, IMO. 3) The instructions say to mill to a depth of 1.22", but the spec is 1.25" +/- 0.10", as far as I know. It's probably good to give a conservative target to avoid overshooting, but it couldn't hurt to state that somewhere.
Love the brass inserts for the buffer tube and pistol grip. Easy to finish. I chose to use a drill press and a dremel rather than the end mill. No problems as long as you have a few hours of dremel experience under your belt. Fast shipping as well. I highly recommend this lower and will be ordering more from TN Arms.
I finished another lower, and found the video and instructions take a little longer, but give a better job. The last one I just bought did not come with a jig; but I have saved one just in case.
I have used p80 and Cnc lowers these are far superior to both. Customer service is outstanding and don’t treat you like they are doing you a favor. Tnarmsco will have all of my future business.
I seem to have gotten all the issues of the previous reviewers (from two years ago, no less) rolled into one. If this receiver were not a great price, and apparently solidly constructed, I'd probably not consider purchasing another. However, it's the best priced 80% receiver I've seen, and the hybrid construction makes it relatively durable but easy on the tools.
I've only milled one of the receivers I ordered as yet, but the mill is too short to the shoulder and it gets in the way of milling the trigger hole, and in the way of milling the rear of the trigger group hole. The fluted part of the mill are long enough for the main trigger group opening, but not to reach the trigger hole through the trigger guide, and not to reach the bottom of the rear of the trigger group hole through the tall part of the jig. If I didn't want to install a safety, this last part would have presented no issue.
The rear takedown area did not mesh with my upper; even with a nylon mallet, I couldn't make the two parts mesh. I ended up chiseling material from the front of the square hole at the rear, and even then I had to alter the takedown pin hole so that the pin could be pressed through the hole in the upper receiver. This left the pin very sloppy (as well as a bitter taste in my mouth.)
Additionally, I had to alter the shape of the curve taht goes to the buffer tube, as my upper wouldn't fit there either. Also, in order to hold the buffer retention pin in place, the buffer had to be screwed in far enough to also interfere with my upper receiver, so it too had to be ground down.
I fixed my own safety selector tightness issue by drilling the holes sloppier than the jig suggested.
Now each of those fit-up issues could indeed be my inexperience, or my upper, but since another reviewer has remarked on the same issues, I'm not convinced.
Lastly, when I received the two that I'd ordered, only one was the color I'd ordered. This issue was reported by another reviewer nearly two years ago. It should already have been fixed; get some better lighting. Or something.
All in all the lower itself is a nice product. I had it engraved with the US flag and it turned out great. The only problem I had was with the milling bit they included. The top of the bit tapers down to the milling part by about 1/16 ". When you are following the outline of the jig , this caused the actual milled receiver to be off by 1/8". The bit was also not long enough to make it through the trigger hole guide before the thicker base of the bit would hit it, and would not make it through the opening to follow the hole guide. All I had to do was go to Home Depot and buy a longer mill bit so not a big deal, just food for thought.