Came across this online and thought people may be interested. I don't know anything about this seller however.
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Tennessee Arms is excited to bring to market our light-weight incredibly strong AR-15 style lower receiver. Manufactured from a high strength Nylon blend with a rediculous amount of fiber reinforcement you will be amazed by the strength and light weight. The colors are molded in to the receiver so you will never have to worry about a scratch or use marring the finish. We reinforce our receivers using our patent-pending technology that includes Marine-Grade Brass inserts that are permanently molded into our lowers. These metal threaded inserts give our receivers the strength needed without sacrificing the weight savings of the composite bodies. The end result is a lightweight, tough as hell receiver you can depend on. To back that up we offer a lifetime guarantee on all our products. We invented the hybrid lower receiver, and have been working on making sure it stays the best on the market ever since.
The TN-Arms 15 is a Nylon bodied AR-15 style lower receiver that has additional metal threaded inserts for strength . This stripped receiver is designed to accept any mil-spec lower parts kit. All colors are molded directly into and throughout the entire receiver so you never have to worry about wearing it off unlike a painted finish. This model sports a redesigned bolt catch area , a repositioned buffer retainer, and all the upgrades we made from previous models. Customers boast about how quickly their builds go together, and this is from the upgrades that customers asked for and we provided. Tennessee Arms will continue working after the sale to improve upon the design to further help you with your future build plans.
Nylon 6-6 Body Marine Grade Brass inserts in Buffer Tower and Pistol Grip Lifetime Warranty against Breakage or Failure Available in Magpul Matching Colors 5.6 Ounces Stripped!!!!!!
Like anything, the tech is getting better. It stands to reason that the "better" mousetrap is coming.
The Glock (plastic) pistol would never last, or that was the rumor in 1983...
The early Plum, Bushmaster, and such were plagued with breakage rumors at the receiver extension, the front pivot lugs, and the pivot pin holes.
I have seen a few of the broken ones, but have not owned one to take it to breakage. Some of the breakage I've seen was general abuse, some was incorrect installation, and some was just plain WTF.
While they are "OK" for light use, they are not generally accepted as a EDC platform. YMMV.
For the difference in price, I've stuck with the metal lowers by choice.
My worry about the Windham CF lowers would be will they react to a fracture like carbon arrows are reported to do, as in pretty much explode when shot from the bow? Are the lowers exposed to the same forces that a carbon arrow is when shot?
The forces are applied in way different areas. Most lowers I've seen were split or cracked from stress.
The carbon arrow has "X" amount of force pushing the mass from behind, and the shaft can't handle the stress before the arrow moves (mass at rest), it splinters into the fiber bundles. OK, one of the physics majors can explain it better...but you get the idea.
Majority of the "force" in an AR is in the barrel and chamber, contained by the locking lugs on the bolt. Sure, the uppers and lowers will split if the rifle fires out of battery, plenty of Google Fu showing the results. Same with the Glock pistol. Unlike the carbon arrow, the polymer formulas are designed to stretch and split, not fragment.
The BCG cycling from the gas systems, and the buffer and spring slamming back and forth stress the pins in the lugs on the lower. The receiver extension is stressed by the buffer operation, but rarely "explodes".
I can think of four poly lowers I've seen, one had a cracked receiver extension ring. The claim was it broke while shooting, but it could also have been over-tightened during assembly.
Two had the front lugs cracked or broken, the owners claimed from normal firing at the range.
One had a crack by the hammer pin hole, but could have been a mis-aligned "bigger" hammer job on the bench.
Came across this online and thought people may be interested. I don't know anything about this seller however.
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Nylon 6-6 Body Marine Grade Brass inserts in Buffer Tower and Pistol Grip Lifetime Warranty against Breakage or Failure Available in Magpul Matching Colors 5.6 Ounces Stripped!!!!!!
A buddy and I each bought one of these recently. I bought mine for a lightweight build, and it's OK for that, but honestly I won't be buying another.
They are pretty rough; lots of casting seams everywhere, lots of flash and burrs that need to be trimmed off. Both of our receivers had to have material removed to fit an upper, not flash but the body of the receiver itself had to be ground down.
We put an hour or two of work into each receiver to make them functional, and I still would not consider them nearly the quality of a $50 blem forged lower.
Also, it's worth noting the brass inserts are only for the threads, they don't really reinforce the buffer tower.
I bought a Patriot complete poly lower assembly for the heck of it(pretty light as the complete lower is poly, the only metal parts are the springs, buffer, plate, castle nut, bolt catch, and trigger pins). I've broken two of their poly rec ext on the first two range sessions with it. One lasted 30 rounds, the other 5! I put a aluminum rec ext on it along with steel take down pins, but haven't tried it since. I'd never trust it for serious business by any means. For messing around at the range it would probably be ok.
