So I had to pretty much custom fit my lower to the parts I have. Hey all, just wanted to share my experience with a late model Polymer 308 lower. I Just received the polymer80 80% 308 lower jig kit. Yeah, iF it makes it through 400 rounds without an FTF, you should buy lottery tickets. Unmachined an 80% Arms 308 lower weighs 435 grams as compared to the 224 grams of the WarrHogg. I run a polymer 80 lower on 1 of my guns that has few thousand rounds through it and haven't had any cracks. Not saying it doesn’t work, or doesn’t have dome benefit, just not enough bennies to forgo some 7075 squished into an ar shape. ,… yes damnet ! Polymer AR-10 80% Lower Receivers Polymer AR-10 (.308) lower receivers are injection molded with glass fiber reinforced Nylon 6-6 that has an excellent strength to weight ratio, is chemical resistant, and withstands high temperatures. Polymer80 reinforces all their lowers, so those broken polymer lowers you see in pictures on the internet, well they are not Polymer80 lowers. I find you last post VERY encouraging. Thanks to Youtube, it became pretty apparent how to “mill out” the trigger group pocket and holes for the pins & safety selector. Constructing the lower wasn't easy as there no such thing as "Milspec" in the 308 AR world (as far as I've researched). Let me know when you do! my partner told me that makeup may be used of firearms one day but again he was laughing when he indicated that , thank you . I don’t do anything special when I buy ammo – whatever I can get my hands on the cheapest – yeah, I’ll take 1000rnds of that. Don’t own a mill, so I got a 6″x6″ sweep XY vice and used my stand alone drill press. How did you secure the buffer tube to the receiver with stripped threads? That said, I’ve seen how quickly your product fails, and when one does the math, it’s hardly worth the bother against a standard aluminum lower. Polymer80, 308 80% Lower Receiver and Jig System – Black $ 111.09 Add to cart AR-15 80% Cerakote Lower Receiver – FDE $ 99.99 Add to cart Polymer80, 308 80% Lower Receiver and Jig System – … with a hammer and sledgehammer . After my labor of love (So to speak) I field tested my rifle and went through a total of 100 rounds of assorted brands of 308. OK let me clear up some of these concerns and questions. >> Once you get under about 7.5 lbs, recoil starts becoming rather snappy. Thanks, the gas system was optimized for unsuppressed fire, so there's not doubt that my rifle was over gassed when firing suppressed. I’m not saying that the piston-based systems aren’t better (I do think they are) but I personally haven’t, nor do I know of anyone who has, seen any modern incarnation of Stoner’s design fail because it got too dirty from soot/blowback – actual DIRT is another matter, but nothing related to the direct impingement design. Ya, its a tough crowd here at TTAG, but also quick to share when the results are good, too. I didn't feel any kind of violent or jarring action when the rifle cycled at any time. So in summary I had a great time working on this lower, and I did put it through it's paces when I field tested it. So in my personal opinion my rifle was working fine, so you'll have to pretty much take my word for it and trust me. We'll also compare and contrast 6061 T6 billet and 7075 T6 forged aluminum, what … -ziggy, Your email address will not be published. I was speaking to THIS particular application. I am not about to pre-order one, but hey, maybe in a couple of years if the guinea pigs, beta testers, early adopters prove the reliability I absolutely will buy one. No-thread design on pistol just because its metal doesn’t mean its better ? They had to come up with the ‘SPORTS’ reminder of how to slap that AR turd when it inevitably malfunctioned. I hope my personal experience will help some of you in some way. I currently own a 350 Chevrolet that was built with good parts and puts out 450 HP to the back tires and is going on 135000 miles. Today we are going to be finishing an AR-15 lower receiver from the G150 kit from Polymer80. just research the kinetic energy areas of rear for bolt passage and buffer tube threading and allignmentation . POLYMER 80 versus ALUMINUM I was impressed with how light the assembled lower was, but when I assembled the weapon, I DID NOT like the side to side flex i could EASILY create with the slightest bit of side to side pressure across the middle of the weapon. My bet is a lot harder than the Polymer 80, the latter of which i’m more apt to call plastic, not polymer. I know they are lighter, depending on milling it won’t be exact, but I will provide that when I get it. ok . But I have never in my life seen a hog that looked like that. lets see what else ? Powered by Invision Community. Mine was bought directly from the JMT website. this way you cut through the color right ? Hey youtube, this is Nate and I I’m going to be giving a review of the James Madison tactical eighty percent AR-15 lower. I know you will be a customer based on this post. lets see if you all have brains and education to figure it all out that glock has already done the research for you ? If you ever plan on trying one out or if you already have one, I would highly recommend stripping it down and giving it a through inspection every 50 rounds and be very careful. The reenforcement helps a lot. .. if your caliber are naysayers. Machining out a polymer 80% lower is so much faster and easier than an aluminum lower though. I do apologize. So I did some on line research and came up fruitless so I thought I should give it a try anyway. 5.56 is a popgun round, so even a low-tech polymer can handle it. Yes I got nailed by it. Not really, the mistake most people make is they clump ALL Polymer products together as if they are all the same design, material, quality and they are not. – ATF compliant design This is the Ar-15 model meaning that … The polymer 80% lower receiver for your.308 platform is engineered and manufactured by James Madison Tactical (JMT) in the USA.   You cannot paste images directly. The Polymer80 jig kit is the most affordable way to buy and build an AR-15, LR-308 80% lower or GLOCK-compatible 80% pistol frame. Maybe that had something to do with the stress crack. We offer a lifetime warranty on all our products and if Polymer was such a terrible choice, there is no way we would be on business by now. My wife has the ATI omni hybrid. If you looking for special discount you'll need to searching when special time come or holidays. McD’s and Olive Garden exist too. Let alone against a metal alloy-matrix printed model that’s even lighter than a polymer. It’s an order of magnitude from acceptable in an AK rifle. what i’ve learned: Never send plastic to do a job meant for metal! I really don’t want to be that guy. If you're curious my lower is made by James Madison Tactical. Email: [email protected]. There ARE Polymer uppers and they ARE very successful. Sexy, aesthetic billet lowers. Fortunately for your warranty, very few people who own this platform ever put more than a few hundred rounds down the pipe in the entire time they own the weapon.   Your link has been automatically embedded. Considering the problems with 5.56 polymer lowers, I don’t .308 version fairing well. × I Mean Your assumptions were all 100% incorrect which means I am definitely doing things right. to the ultimate self test initiative ! At all.Got it.” Ok. Got it. I can’t seem to find that info anywhere. Represents who built from an aluminum design and you all have brains and education to figure all... Period and you get under about 7.5 lbs, recoil starts becoming rather snappy hearing more, and 'll... Because I thought maybe it was an optical illusion, but you don ’ t want to a! To you for putting in the mean-time ; here you go then are... I read it got a 6″x6″ sweep XY vice and used my alone! My GWACS lower works just fine has a 18 '' 1/10 Criterion barrel with a mid length system! 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