LW-4 Stripped Polymer Lower

All was great except out of the 4 I ordered 2 of the buffer tube threaded ends were warped . So when cycling the gun the buffer spring was pushed against the inside of the tube causing it to shorten the cycle and not load another round. Thanks to milwaukee m18 heat gun and common sense I straiten it and cycling consistently now . But all is good for the $ you save and weight. Jtm poly lowers had a worse problem .. 2 were non usable.

Either I used a spring and detent the receiver didn't like, or the channel for the spring wasn't drilled quite deep enough/there was leftover material in the channel. I choose to blame myself in this case as I've dealt with both latter issues before without it ending this way. Either way, my front takedown pin (Strike ultralight) became completely jammed in place, fully inserted, after installing it the first time. The detent was so securely fixed in the takedown pin that I couldn't even begin to back it out with a hammer and punch, and I was entirely unable to push the detent down to attempt to spin or push the takedown pin out. After an hour of trying to non-destructively remove the takedown pin, I gave up and hit it with a wrench. Long story short, the pin is out and my receiver is in pieces. The receiver felt and looked great. It was light and strong and didn't feel cheap in any way. I feel awful about destroying something someone put time and skill into more than I feel bad about not getting to build another rifle. The slick sided upper I ordered with the lower is also awesome. Just without a home for a while due to my own actions. I've built a handful of ARs in the past without any major issues, so I don't feel like I'm completely incompetent. I sure felt like it this time though. This particular project wasn't meant to be, I guess. Maybe I should've just used the polymer detents instead of trying to use the ones I normally favor. Sorry guys.

I like polymer while the upper receiver is aluminum ,it's all good for personal civilian use, I'm not in a war zone? where the aluminum upper and lower is needed , everyone has their preference ?

As expected when I ha so called "10 day cooling off" time frame , it's all good, I got the products I ordered tho hA THANK YOU NFA

This is the fourth polymer lower receiver I've ordered and the first from NFA, the others weren't worth keeping, but the quality of this lower receiver is better than the other polymer receivers I've tried, so I'll be keeping this one. The only problem I ran into with the lower was the hole for the safety detent wasn't drilled completely thru and the safety spun freely. I had to finish that hole and now the safety works fine. Regarding the lower parts kit: as recommended by NFA, I used their lightweight polymer parts kit, which turned out to be a waste of money, the qaulity of the parts kit was terrible. The safety was plastic and felt terrible, so I replaced it with a standard mil-spec metal one. I used the mag release that came in the kit as a standard mil-spec one fit too snugly in the left side of the receiver and would bind. the takedown pins were plastic and flexed, and just felt cheap, and the worst part of all was the trigger, which I had to video because I felt was unsafe. I could pull the trigger, hear and feel a click, but the hammer wouldn't fall, unless I applied more pressure to the trigger, which wouldn't move any further but would allow the hammer to fall. I was able to duplicate the condition with the upper receiver removed, and after the trigger click, the hammer would still hang up, but would drop if I bumped the receiver, or if I pushed the top of the hammer with a finger. NFA states the warranty on the lower receiver is void if I use a metal trigger and hammer, but their lightweight plastic one is definitely not staying in my receiver. I've reported this to NFA and offered to send the videos, but have yet to hear from them days after emailing them, I'll update later if they respond. Summarize: Lower receiver, 4 stars, pretty good. lower parts kit, 1 star, going in the garbage

I bought this to replace my polymer 80% lower that only lasted a year on my 300 blackout AR Pistol. I've had this carbon fiber lower for 2 or 3 years now and it is great.! and it is half the weight of my polymer lower. here are some lower weights to compare this to, my stripped billet lower weighs 10.4 Oz., my polymer lower weighs 5.86 Oz., and this carbon fiber lower only weighs 3.73 Oz! you will notice the weight difference when you switch to one of these. And it is plenty strong for the 30 cal. bullets I use. I use my AR pistol when camping in wilderness areas and hiking on the Appalachian trail. It is outside a lot and still looks and functions as it always has, if your looking to lighten up your AR, this is the best lower for the job. the bolt lever fits and works great on it too. unlike my Black Rain Ordnance Billet Lower, it doesn't clear on that. I build ar's and have tried several brands over the years, but this is the one I tell my clients to get. I only build side charging uppers and it's great for those too. the parts fit nicely and I have never had a problem with anything on this lower. this is the best and cheapest way to reduce the weight of your AR and it is super strong. Now I am slowly replacing the lower parts with titanium parts, and those can be expensive, but you don't have to buy them all at once, buy a few here and there and it doesn't take long to make this even lighter, comes in handy when carrying it in my back pack on the trails I hike. I will be buying more when they come back in stock. was hoping to buy one today but see they are out of stock. you will definitely like it so buy with confidence. New Frontier makes good stuff!