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这个解释比较贴近我一直以来的认知。
Forged vs Billet vs Cast vs Polymer
Since a forged receiver is very close to its final dimensions when it comes out of the forge, there isn’t a lot of room for customization and they are all about the same, no matter what company machines them. Some companies have manufactured their own dies, but they still carry a very similar style. Where manufacturers can offer some proprietary features is in their finishes, tooling quality, weight/material removal or their engraving and roll marks. Otherwise, they are all extremely similar with a few exceptions like the VLTOR receivers.
The forging process gives the aluminum a continuous grain characteristic, which results in the receiver becoming stronger than a cast or billet part of the same thickness. This forging process can also have slight surface imperfections such as small divots. The forged receiver has been the standard for decades and is the most popular type of receiver.
Billet receivers can be made (and usually are) with thicker walls and unique designs because the machinist is starting with a raw block of material. Thicker walls help to minimize flexing in the receivers, making for a more rigid platform. Most of the time, this added strength comes with added weight.
Historically, the general consensus has been that billet offers more precision. Where billet has an advantage is when the lower and upper receivers are milled/fit as a “matched set”. These sets allow a tighter fit when paired together because they are hand fit at the factory and stay together during the whole process of manufacturing. A tighter fit can help increase shot to shot accuracy at longer ranges.
Billet receivers typically cost more than forged because of the extra machining time or additional feature sets. We recommend primarily considering the different features that are offered and then look at the aesthetics. The price increase is easier to justify if you're getting better use out of unique features, instead of just paying for a unique look.
In our opinion, cast receivers (especially uppers) should be avoided like Ebola. Cast receivers don't have the strength or durability to stand up to the abuse we put our rifles through during 3 gun matches, patrol work or military purposes. The price increase from a cast receiver to a forged receiver is minimal, so we highly recommend saving a few extra bucks and staying away from any kind of cast receivers.
Polymer receivers have seen an increase in popularity over the last few years. Many manufacturers incorporate polymer receivers into their .22LR rifles to shave weight and reduce costs. While there are some good quality polymer receivers on the market, we feel that it's just not a durable enough of a material to withstand the abuse that someone might put it through. For rifles that will see extremely light use, a polymer lower would probably be just fine. Due to the pressures and wear characteristics, a polymer upper receiver is not recommended for any caliber other than a .22LR.
Broken Polymer Lower
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Broken Polymer Magwell and Pins
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Conclusion
For all intents and purposes, billet receivers are more refined and every manufacturer offers some sort of proprietary aesthetics or features to set them apart. While billet may look “cooler”, add features or give your rifle a more refined feel, the justification for the price delta is entirely up to the end consumer. Inherently, AR style rifles will function the same whether they are built on billet or forged receivers. Both will have some common feature sets like M4 feed ramps and fire control markings. Similarly, a Timex and a Rolex will provide accurate timekeeping; one just does it with more precision, finesse, durability and style.
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发表于 2017-8-25 20:33
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话说，这个的确有点象stock哈，我看着还是有点不sure