Around the time that you got your rifle, SAI was still putting some USGI parts on their rifles. Whatever they had on hand, until their stock ran out. It was a little later that they started putting 100% aftermarket parts on their rifles. A lot of the parts I believe they produce themselves or...
I have a switch on mine that I put on for a photo op. Left it on there and the other day I got bit when pulling back the op rod....LOL
I'll go back to the button before my next range outing.
Here's a pic that shows just how much the switch sticks out.
It would be wise to keep an eye on the headspace. Chinese bolts have been reported to be softer than USGI bolts. In order to use a USGI bolt, the receiver will need some modification to it. There are several smiths out there that can do the cionversion.
Norinco receivers can also be soft...
There are quite a few options for the M14 platform. While I am a traditionalist when it comes to the M14 rifle, there are some mighty fine looking modern versions to consider.
SAI rifles are a great start as they have a lifetime warrantee. It is my belief that for every bad thing said about them, there are probably 20 more good things that are not posted about them.
Although SAI rifles are not made with USGI parts anymore, reports are that in most cases, they are...
Not sure who you are as some orders were lost in a hard drive crash. Again please accept my apologies.
All kits are currently and will remain in stock as steps have been made to keep them in stock.
With that being said, The "Button" was how most M14 rifles were issued back in the day...