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Posted: 4/22/2013 5:00:11 AM EDT
Sorry in advance. Is this a required part in a build, or optional. 
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| Required to hold your rear take down pin detent and spring. You could in theory tap it and set screw it but you'd still want to put the end plate on it. Why the bother they are cheap cheap cheap and if you buy a buffer tube kit they are included. If not then look into the Noveske or Fortis QD End plate... |
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Required. It covers the open rear of the receiver and when it's tightened down with the castle nut it holds in the rear take down detent/spring in place which helps hold the upper/lower together.
But there are a few aftermarket endplates you can use instead like the Magpul Slingplate adapter and other quick attach plates. But you don't need a regular end plate when you're using one of those. It's going to be one or the other- getting both doesn't work so well 
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You don't need an end plate with most fixed stocks (including this one). The stock is the end plate as it holds in the take down spring. eta: I just installed the same stock last week and really like it. |
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You could have included that in you original post OP......... 
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Quoted:
You could have included that in you original post OP......... Lol, yeah, not required on a fixed rifle stock. |
For the sake of being thorough, let me show you what everyone is talking about: That's where the rear detent pin & spring go into the lower receiver. Without the end plate....WHOOSH!...across the room your spring shall fly. However, if you're using a rifle buttstock, you'll notice that the rifle end of the stock completely covers this area, thus holding in the spring and obviating the need for the end plate unless, of course, you want to insert one in there for utility purposes such as securing a sling.
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Quoted:
...unless, of course, you want to insert one in there for utility purposes such as securing a sling. Don't stick a carbine end plate under a rifle buffer tube. You may end up with a bit too much travel, allowing the gas key to slam into the lower receiver. They make stock spacers with sling mounts for rifle stocks that don't affect how far the buffer tube threads in. |
| The receiver end plate is also used to prevent the extension tube from twisting on collapsible stocks. Some receivers such as KACs do not need the plate to keep the detent and spring in place as they are located on the bottom of the receiver and secured via the pistol grip, but are necessary to keep the extension aligned. |
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Quoted: Quoted: ...unless, of course, you want to insert one in there for utility purposes such as securing a sling. Don't stick a carbine end plate under a rifle buffer tube. You may end up with a bit too much travel, allowing the gas key to slam into the lower receiver. They make stock spacers with sling mounts for rifle stocks that don't affect how far the buffer tube threads in. |
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